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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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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