A car travels the first half distance with constant velocity of 40kmph and the remaining half with a constant velocity of 60kmph. The average velocity of the car in kmph is
A
40
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B
45
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C
48
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D
50
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Solution
The correct option is C48 Let the total distance be 2D For first half distance D, Time taken=DistanceAverage Speed=Dv1 For the second half distance D, Time taken = Dv2 For total journey : Total distance=Average speed×total time 2D=vav(Dv1+Dv2) ⇒vav=2v1v2v1+v2=2×40×60100=48kmph