A car moving on a straight road covers one third of the distance with 20 km/hr and the rest with 60 km/hr. The average speed is (a) 40 km/hr (b) 80 km/hr (c)46 X2/3 km/hr (d) 36 km/hr
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Given,
Velocity for one third of distance V1=20km/h
Velocity for two third of distance V2=60km/h
Time take to cover one third of distance t1=V1d/3=20d/3
Time taken to cover two third of distance t2=V22d/3=602d/3
Average velocity =totaltimeTotaldistance
Vav=t1+t2d=20d/3+602d/3d=36km/h
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