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Two buses P and Q start from a point at ...

Two buses P and Q start from a point at the same time and move in a straight line and their positions are represented by `XP (t) = alphat + betat and X_Q (t) = ft-t^2` . At What time, both the buses have same velocity?

A

`(alpha-f)/(1+beta)`

B

`(alpha+f)/(2(beta-1))`

C

`(alpha+f)/(2(1+beta))`

D

`(f-alpha)/(2(1+beta))`

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