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:
Pick one
A) 3/8 B) 3/2 C) 3/6 D) 3/1 E) 3/7
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: