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:	Choose the correct choice from the following answers
A) 3 : 1	B) 3 : 2	C) 3 : 4	D) 3 : 5	E) 3 : 28
Let the speeds of the two trains be x m/sec and y m/sec respectively. Then, length of the first train = 27 x meters, and length of the second train = 17 y meters. (27 x + 17 y) / (x + y) = 23 ==&gt; 27 x + 17 y = 23 x + 23 y ==&gt; 4 x = 6 y ==&gt; x/y = 3/2.   Answer: 3 : 2
<result>B</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: