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Re: John is a trail runner who decides to take a day off work to run up [#permalink]
to calculate average of 2 speeds a and b when distance is constant
Formula - 2ab/(a+b)
Here John's uphill speed = 5 mph
John's downhill speed = 7 mph
2*5*7/(5+7) = 70/12 = 5.833
Correct answer - B
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Re: John is a trail runner who decides to take a day off work to run up [#permalink]
Hello from the GMAT Club BumpBot!

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Re: John is a trail runner who decides to take a day off work to run up [#permalink]
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