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Q.

A train 100 m long travelling at 40 ms-1 starts overtaking another train 200 m long travelling at 30 ms-1. The time taken by the first train to pass the second train completely is

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a

30s

b

40s

c

50s

d

60s

answer is A.

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Detailed Solution

Relative velocity of overtaking = 40 - 30 = 10 ms-1. Total relative distance covered with this relative velocity duringovertaking = 100 + 200 = 300 mSo time taken = 300/10 = 30 s
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