Here is one solution: d/v for Dave = d/v for Jim + d/v for Tim d is distance and v is velocity or speed time = d/v 5 seconds = 6 feet/6 feet/seconds + 4 feet/v 5 seconds = 1second + 4 feet/v 4seconds= 4 feet/v v * 4 seconds = (4feet/v ) * v v* 4 seconds = 4 feet v= 4 feet/4 seconds v for Tim = 1 foot/second