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: Answers.
A) 1:3  B) 3:1  C) 1:2  D) 3:2  E) 2:1
Let the speeds of the two trains be x m/sec and y m/sec respectively.   Then, length of the first train = 27x metres,   and length of the second train = 17y metres.   Therefore, 27x + 17y/(x+y)= 23   =27x + 17y = 23x + 23y   =4x = 6y   =x/y	= 3/2.   Answer is 3:2.
<result>D</result>
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: