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:	Select the correct option:
A) 1 : 3
B) 3 : 2
C) 3 : 4
D) 3 : 5
E) None of these
let length of trains are x and y   so speed of the trains will be x/27 and y/17 respectively.   now to cross each other time taken=23 second,   so (x+y)/((x/27)+(y/17))=23   (27*17)(x+y)/17x+27Y=23   so, ((x/y)+1)/17(x/y)+27=23/27*17   (x/y)+1=(23x/27y)+23/17   4*(x/27)=6*(y/17)   so,(x/27):(y/17)=3:2   so ratio of speed of the train will be 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: