Calculate the pumping speed of this beam pumping unit?

This article details how to manually calculate the pumping speed of a pumping speed unit:
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[@impactodelsurenterprise2440]

The output rpm of this unit is exactly the acceleration of gravity. Don't know if that is a coincidence or just an easter egg put in by the designer.

[@texasfairbanksman272]

6 1/8 spm

[@almtheer10]

SPM = strokes / time in minutes = 6

[@xtzzxy]

How to make it 10

[@El16100]

1.5mph

[@knobsdialsandbuttons]

lol