Question

Two trains running opposite directions cross a man standing on the platform in 27 second and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speed is

Answer 1

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

Then, length of the first train = 27xmetres,

and length of the second train = 17ymetres.

27x + 17y= 23x+ y

 27x + 17y = 23x + 23y

 4x = 6y

x=3.y2