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 24 seconds, what is the ratio of their speeds?	Answers
A) 1:3  B) 3:1  C) 7:3  D) 3:2  E) 3:4
Let the speed of the trains be x and y respectively   length of train1 = 27x   length of train2 = 17y   Relative speed= x+ y   Time taken to cross each other = 24 s   = (27x + 17 y)/(x+y) = 24   = (27x + 17 y)/ = 24(x+y)   = 3x = 7y   =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 . If they cross each other in 24 seconds, what is the ratio of their speeds?