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Correct option is B)

Time taken to complete the half distance with velocity $v=40km/h$,

$t_{1}=2×40x =80x hr$. . . . .(1)

The time taken to complete another half distance with velocity $u=60km/h$

$t_{2}=2×60x =120x hr$

The total time taken, $t=t_{1}+t_{2}$

$t=80x +120x =48x hr$

The average speed of the car,

$v_{avg}=x/48x =48km/h$

The correct option is B.

Solve any question of Motion in a Straight Line with:-

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