Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively. If they cross each other in 23 seconds, what is the ratio of their speeds?  Choices.
A) 1:2	B) 3:2	C) 3:1	D) 1:3	E) 1:4
Speed =x and y resp   length of first = 27x   length of second train = 17y   related speed = x + y   time taken to cross each other = 23 s   27x+17y/x+y = 23   27x+17y = 23(x+y)   4x=6y   x/y=6/4=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. If they cross each other in 23 seconds, what is the ratio of their speeds?