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Question

A car moving on a straight road covers one third of a certain distance with 20 Km/h and the rest with 60 Km/h. The average speed is :

A
40 km/h
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B
50 km/h
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C
36 km/h
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D
55 km/h
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Solution

The correct option is C 36 km/h

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=d/3V1=d/320

Time taken to cover two third of distance t2=2d/3V2=2d/360

Average velocity =Totaldistancetotaltime

Vav=dt1+t2=dd/320+2d/360=36km/h


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