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A train 400 m long travelling at a speed of 64 km/h crosses another train 720 m long moving in the opposite direction at a speed of 80 km/h . How much
Question

A train 400 m long travelling at a speed of 64 km/h crosses another train 720 m long moving in the opposite direction at a speed of 80 km/h . How much time does the second train take to cross a man sitting in the first train?

A.

18 sec

B.

16 sec

C.

12 sec

D.

15 sec

Correct option is A

Given:

Length of two trains = 400m and 720m

Speed of train = 64km/hr and 80km/hr respectively

Formula Used:

Time =DistanceSpeed= \frac{Distance}{Speed}​​

Solution:

Relative speed of two trains = 64 + 80 = 144km/hr

Speed in metre per second = 144×518144 \times \frac{5}{18}​ = 40m/sec

If man is sitting in first train distance = length of second train = 720m

Time taken =72040 \frac{720}{40}​ = 18seconds

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