A man walks uphill at an average speed of 3 km/hr and downhill at an average speed of 5 km/hr. find his average speed on a journey over 18 k

Question

A man walks uphill at an average speed of 3 km/hr and downhill at an average speed of 5 km/hr. find his average speed on a journey over 18 km of uphill and 20 km of downhill terrain.

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Adeline 1 month 2021-08-20T03:36:52+00:00 1 Answer 0 views 0

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    2021-08-20T03:38:42+00:00

    Answer:

    Uphill speed = 10Km/h

    Downhill speed = 36Km/h    

    Let distance = x

    Average speed = total distance /time

                              = (x+x)/(x/10 + x/36) = 15.65 m/s

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