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22 August, 15:21

If ying zyiyu covered the first 200 miles of a trip going at 50 mph and the last hundred miles going at 40 mph, what was his average speed for the entire trip? Teacher told me it is not 45

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  1. 22 August, 15:28
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    Average speed is (total distance) / (total time).

    To find the total time we need to do some division.

    Time for 200 miles=200/50=4 hours.

    Time for 100=100/40=5/2 hours.

    Total time=13/2 hours. Total distance=200+100=300 miles.

    Av speed=300 / (13/2) = 300*2/13=600/13=46.15 mph approx.
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Home » Mathematics » If ying zyiyu covered the first 200 miles of a trip going at 50 mph and the last hundred miles going at 40 mph, what was his average speed for the entire trip? Teacher told me it is not 45
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