Question

The ratio between the speeds of train J and K is 7:5 respectively. Train J which is (a+140) metre long can cross a pole in 24 seconds. If train K can cross a man in 28 seconds, then find out the difference between the speeds of both trains. It is assumed that both of the trains cross each other in (77/3) seconds.

Q: Answer-The ratio between the speeds of train J and K is 7:5 respectively. Train J which is (a+140) metre lo...

The ratio between the speeds of train J and K is 75 respectively. Lets assume the speed of train J and K is 7y and 5y respectively. Train J which is a140 metre long can cross a pole in 24 seconds. a14024 7y a140 168y Eq.i If train K can cross a man in 28 seconds. Lets assume the length of train K is k. k5y 28 k 140y Eq.ii It is assumed that both of the trains cross each other in 773 seconds. a140k7y5y 773 a140k12y 773 Put Eq.i and Eq.ii in the above equation. 168y140y12y 773 308y12y 773 773 773 We cannot obtain anything from the given information in the question. So the answer cannot be determined.