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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 X P (t) = α t + β t 2 and X Q (t) = ft – t 2 . At what time, both the buses have same velocity ?

1. β + − α 1 f
2. ) 1 ( 2 f − β + α
3. ) 1 ( 2 f β + + α
4. ) 1 ( 2 f β + α −

Correct answer: ) 1 ( 2 f β + α −

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