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A 270 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train?

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1. 

A 270 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train?

[A]. 230 m
[B]. 240 m
[C]. 260 m
[D]. 320 m
[E]. None of these

Answer: Option A

Explanation:

Relative speed = (120 + 80) km/hr

   = 1-sym-oparen-h1 200 x 5 1-sym-cparen-h1m/sec
18
   = 1-sym-oparen-h1 500 1-sym-cparen-h1m/sec.
9

Let the length of the other train be x metres.

Then, x + 270 = 500
9 9

 x + 270 = 500

 x = 230.

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