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Two cars P and Q starts from a point at ...

Two cars P and Q starts from a point at the same time in a straight line and their positions are represented by `X_p(t)=at +bt^2` and ` X_0(t)=ft-t^2`.At when time do the cars have the same velocity?

A

`(a+f)/(2(1+b))`

B

`(f-a)/(2(1+b)`

C

`(a+f)/(2(b-1)`

D

`(a-f)/(1+b)`

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