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 24 seconds. The ratio of their speeds is?	Pick.
A) 3/6
B) 3/2
C) 7/3
D) 3/5
E) 5/2
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) = 24 ==&gt; 27 x + 17 y = 24 x + 24 y   ==&gt; 3 x = 7 y ==&gt; x/y   = 7/3.   Answer:7/3
<result>C</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 24 seconds. The ratio of their speeds is?