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Q.

There are two trains moving towards each other with a speed 15 m/s and 20 m/s. Their lengths are 124 m and 121 m respectively. How much time would they need to cross each other?

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a

7 seconds

b

11 seconds

c

35 seconds

d

49 seconds

answer is A.

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Detailed Solution

S 1=15 m/s ,S 2= 20 m/s

L 1= 124 m ,L 2= 121 m

T=L1+L2S1-S2=124+12120+15→24535=7 SECONDS

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