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Question

Two trains running in opposite directions cross Jayanth standing on the platform in 30 seconds and 20 seconds respectively and they cross each other in 26 seconds. The ratio of their speeds is?

  • 4:3
  • 3:2
  • 2:1
  • none
Answer- B

Let the speeds of the two trains be x m/sec and y m/sec respectively.

Then, length of the first train = 30x metres,

and length of the second train = 20y metres.

(30x + 20y)/(x+ y) = 26

30x + 20y = 26x + 26y

4x = 6y

x/y = 3/2 .