What was their average speed?

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Naina and Eesha, track stars with superb hearing, ran as fast as they could to catch up to the ice cream truck in the next town over.
They averaged 6 kms per hour, then rested to enjoy their ice cream.
They averaged 4 kms per hour over the same distance on the way back.
Not counting the time they rested, What was their average speed?

posted Jun 12, 2020
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1 Answer

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4.8 km/h

If the distance is x, then they spent x/6 hrs on one direction and x/4 hrs on the way back
Total distance= 2x
Total time= x/6+x/4= 5x/12
Average speed= 2x: 5x/12= 24/5= 4.8 km/h

answer Jun 12, 2020

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