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A train 200 m long crosses a bridge 300 m long with uniform acceleration. It enters the bridge with a speed of $30 {ms}^{- 1}$ and leaves it with a speed of $50 {ms}^{- 1}$ . What is the time taken to cross the bridge?

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An Intiative by Sri Chaitanya

7.5 s

15.0 s

2.5 s

12.5 s

answer is C.

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