Time Speed and Distance 5 | CAT Preparation 2024 | Arithmetic | Quantitative Aptitude

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[@muskaandua5039]

To all the ppl getting confused in the first ques …both the methods are correct and the answer would’ve been correct if the ultimate question asked was what is the actual distance (which is 20 km since while solving we divided speed x time by 2) ; but the question asked was the total distance covered and since the distance was covered twice so we don’t need to divide the distance ( distance = speed x time ) by 2 and the answer would be 40 km

[@Endever10]

Ikik😊

[@ajayjoshi9256]

in the first question while solving through lcm the distance covered for 29 hours is 200 and not 100, because 100 is covered at 25km/h and remaining 100 is covered at 4km/h. which gives answer as 40 as total distance covered. what sir has calculated is the distance for one way only in both the cases

[@vibhatiwari909]

Wo 25ki speed se 100 chala aur 4 ki speed se bi 100 km chala

[@vibhatiwari909]

Wo 25ki speed se 100 chala aur 4 ki speed se bi 100 km chala

[@swapneelrao8276]

yes right, whenever we apply LCM formula, 2 different speeds are given for a particular distance. We never add those. Here we have to add since we are finding out the distance of total journey!

[@manditbanthia7057]

Answer will be 20km

[@chandansinghpatni]

@@manditbanthia7057 How if you apply average speed concept then distance will e 40 km.

[@mayanklashkari279]

Thxxxx RAVI SIR you are like Ravi(sun) of morning of my life.😂😂

[@raghav_daga]

The issue in the first and the second sum the second sum was done perfectly when sir divided the distance into 2 halves and that is why the time is also changes as 168/21 would give 8 hrs but sir did 84/21 thats why 4 hrs and so the distance came to 336kmat the last, if in the first sum the distance had been divided into 2 halves then time at 25km hr would be 50/2 i/e 2 hrs and at 4km hr would be 50/4 i.e 12.5 hrs total 14.5 hrs will be 100 so 29/5 hrs will be (100/14.5)*(29/5) which will give 40 km i.e the total distance.

[@dheerajkumar4487]

Dear Sir, in 2nd ques @11.12, you have answered the distance when it is asked the total distance

[@restyletime4918]

God bless the star that exploded to create the elements that formed our planet, leading to the evolution of life and eventually giving us the opportunity to learn from you

[@Athrav-qq9ue]

are u for real?

[@letssearchforsolution6686]

We can also convert all values to time ( that can be the third method )

[@preraksinha3319]

in the first question the ans will be 40 we can get the total distance by multiplying the average speed and the TOTAL TIME and we will get 40 as the answer

[@yogendrapratapsingh7618]

In 1st question LCM method 29hrs -> 200 Km (sir kinda missed it and wrote 100Km) as we assumed 100Km of one side. So when we are taking 29hr (T_scooter+T_walk) we need to take both the distance i.e 200. and following rest will give us One side distance as 20km. Same that we got from 2nd method.

[@Jay-zx3mx]

The Distance=Lcm() which we take is which Distance, is it the total distance D or it is d (half one)

[@vk9401]

"Find the distance" in 2nd que means total distance ?

[@ganeshreddy5264]

Sir doubt 20 km is half distance so total distance must be 40km

[@KlutchyRex]

thanks for everyone who mentioned that calculative mistake in the scooter and walking question

[@kshitijbalonie4361]

Thank you sir

[@mbagirl03]

Hats off to your effort sir..❤

[@raniyashaikh-xl1sp]

Can the answer of last ques be 45???

[@akarshtripathi8743]

sir i want to ask that how do we know that when to use LCM method

[@krutikasharma9116]

Hiii

[@manditbanthia7057]

What is the answer of 2nd question

[@Shivam_General_Fitness]

Thanku sir

[@reshumishra3992]

Sir first question ka answer 40km hoga na considering both the sides?

[@subham625]

Yes total distance is asked hence 40

[@behindthescene4406]

No total is 20 bcz he had already considered time for going n comming back (25 +4 ) = 29

[@vigneshps397]

@@behindthescene4406 yeah but for that 29hours he covers 200km not 100km

[@shreyasichakraborty3292]

Same query

[@behindthescene4406]

@@shreyasichakraborty3292 no the ans is 20 itself becz he already assumed total distance as 100 ...in previous lectures he told that what ever we had assumed according to that we need to perform the calculations .

[@Nandiniarya-rq9zs]

In LCM method can we plus and minus the time according to our convince?

[@krutikasharma9116]

Hiii

[@Diabolical3010]

guys i am doing questions by taking ratios, is that fine? i just figured you can take ratios and the answer is the same

[@Diabolical3010]

Like for example in the second question we can take 21/45 * 15( hours) so 7 hours and 8 hours is the time taken and there 168km each and total distance 336km

[@jaiganeshbaskar9888]

@@Diabolical3010 Yes Ig ratio method is way easier and faster to calculate

[@soumyajitghosh6402]

Can anyone tell why we are using lcm in this type of questions? I mean I have got the trick but my question is why? Why we are using lcm to get the initial distance? That I didn't get

[@ravisachdeva9401]

you could assume any number as the distance, but considering as LCM makes calculation easy for time, as this ensures we get time as integers and not fractions

[@Suryakumar-Tsk]

@@ravisachdeva9401 bro please tell why we are using lcm in this sum , not in another , what's the reason bebind it ...

[@rhythm2627]

In last ques time intervals are equal so sir has considered them in ap which is correct obvio , but can we consider them to be in HP ?? Then B = under root AB.... and we will get a different ans

[@saichander6384]

under root ab will be if they are in GP, but it is in HP, so, the answer is correct

[@vishal7269]

Why in first question we have divided 29 by 29 by 5 ?

[@rohankrishna1818]

It's equal to 5hr 48mins

[@selenator980]

the ans is 40 km for 1st que for sure checked from multiple sources.

[@TanyaMalhotra-qy4rj]

In the previous video while applying this concept you took the difference between the hours and compared it with L.C.M but in this video you added hours and then compared to L.C.M!. I didn't got this..

[@mokshhanduja6726]

Tompers bache😁😁

[@pavithran5515]

In previous video there were 2 persons travelling the same dist so after lcm we are taking diffrence. Here a single person travelling a dist in two diffrent mode of transport in two diffrent speeds so we are adding the two variables after lcm. Pls correct me if i am wrong

[@Varunnsingh]

because in this quest total distance is asked so we have to add both the time

[@manu-wd8bv]

1st question ka find ans. Kya hoga 20 ya 40 ..plz tell

[@diyamulchandani-hn2te]

40

[@pranavkumar-yn6ig]

The distance part is super confusing

[@preacher00000]

22:00

[@kothajagadish9819]

Better than paid contents cat coaching

[@zoyafatima6052]

In the first question the method is correct , the answer is also correct just the last step Sir forgot...total distance = 20km+ 20km= 40 km(ans)

[@krazee...9687]

yes

[@akashbarve9030]

yaa

[@hm_t]

Ohhh hello.. Ans is 20 as whole journey time is given nd distance calculated on whole journey time so ans is 20 km.. Sir is right... Don't be oversmart

[@Codro09]

Days left 59 for my cat exam😅.

[@AmanSingh-sl2mc]

Aap bhi Ravi sir se he padte ho ya or koi course bhi le rkhe hn

[@shaileshmishra6833]

Actual ans is 40 kmts bcs if Ans is 20 then 10km waking and 10 km scooter So total time will be 10/4 +10/25 = 2.9 hr or 2hr 54 min which is wrong BCz in question total time is 5hr 48min Now take 40km as a distance so by previous method 20/4 +20/25 = 5.8 hr or 5hr 48min which is given in question SO CORRECT ANS WILL BE 40 KM.

[@NandiniMaheshwariArts]

No it’s 20

[@ADITYA-te9fy]

Last question mei Sb kaisey calculate kiye agr a,b,c teen log hai toh 3abc/a+b+c hoga na

[@gorangvishnoi7657]

Rajan Rajpoot bro! Apna division ke basics clear kro phele lol!

[@mitulkotadia615]

Bhai I think vo 3abc÷ab+bc+ac hai

[@harshgupta2388]

@@gorangvishnoi7657 bhai explain hi krdete yr ki wo glt kaise h?

[@ultimatespectator137]

The ans for the first ques would be 40km. There was slight error while using LCM method , and the question he gave asked for total dist. not of one side. ( 100km ko 50km + 50 km assume karlo then solve just as he did in the next problem). Cheers!

[@manditbanthia7057]

It will be 20km

[@ArpitKharbandaIsAwesome]

@@manditbanthia7057 Explain

[@mxdhavv]

@@manditbanthia7057 20km is the distance from first point to second point. Total distance required is twice the calculated distance here

[@raghav_daga]

@@manditbanthia7057 The issue in the first and the second sum the second sum was done perfectly when sir divided the distance into 2 halves and that is why the time is also changes as 168/21 would give 8 hrs but sir did 84/21 thats why 4 hrs and so the distance came to 336kmat the last, if in the first sum the distance had been divided into 2 halves then time at 25km hr would be 50/2 i/e 2 hrs and at 4km hr would be 50/4 i.e 12.5 hrs total 14.5 hrs will be 100 so 29/5 hrs will be (100/14.5)*(29/5) which will give 40 km i.e the total distance.

[@vikasverma6502]

Sir ka answer correct hai (20km) .Isko hm straight line motion consider kr sakte hai .half distance covered by 25 km/hr and half 4 km/hr and total time taken =5 hour 48 min .

[@BullseyeBY]

question is distance he covered so its 40

[@manditbanthia7057]

@@BullseyeBY 20 will be the answer

[@Acchakma]

​@@manditbanthia7057 ans is 40 cause if it was 20 then time taken wouldn't match. e.g. time taken to cover 20 km @ 25 is 48 mins only.