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Q.

A train 200 m long crosses a bridge 300 m long. 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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a

2.5 s

b

7.5 s

c

12.5 s

d

15.0 s

answer is C.

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Detailed Solution

Total distance travel 200 + 300 = 500 mS=u+u2t, 500=30+502tt=12.5sec
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