Two trains running in opposite directions cross a man standing on the platform in 20 seconds and 18 seconds respectively and they cross each other in 19 seconds. The ratio of their speeds is:  Select:
A) 1 : 1 B) 3 : 2 C) 3 : 8 D) 3 : 25 E) 3 : 4
Let the speeds of the two trains be x m/sec and y m/sec respectively. Then, length of the first train = 20 x meters, and length of the second train = 18 y meters. (20 x + 15 y) / (x + y) = 19   ==&gt; 20 x + 18 y = 19 x + 19 y ==&gt; x = y ==&gt; x/y = 1/1   1 : 1nswer: Option 1 : 1
<result>A</result>
Two trains running in opposite directions cross a man standing on the platform in 20 seconds and 18 seconds respectively and they cross each other in 19 seconds. The ratio of their speeds is: