Question

# A man travels 1st 50 km at 25 km/hr next 40 km with 20 km/hr and then 90 km at 15 km/hr Then find his average speed for the whole journey (in km/hr)

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Solution

## Given,Distance = 50 km, Speed = 25 km/hDistance = 40 km, Speed = 20 km/hDistance = 90 km, Speed = 15 km/hNow, For finding the average speed we must have to find the total time takenSo,For 1stTime=DistanceSpeed=5025=2h For 2ndTime=DistanceSpeed=4020=2h For 3rd Time=DistanceSpeed=9015=6h Now,Averagespeed=TotaldistanceTotaltime=50+40+902+2+6=18010=18km /hHence the average speed is 18 km/h

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