Question 152: Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is:

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Let the speeds of the two trains bexm/sec andym/sec respectively.Then, length of the first train = 27xmetres,and length of the second train = 17ymetres.27x+ 17y= 23x+y27x+ 17y= 23x+ 23y4x= 6yx=3.y2