30. Two trains A and B are running in the opposite directions. Train A crosses a man standing on the platform in 27 seconds, while train B crosses the same man in 17 seconds. If they cross each other in 23 seconds, then the ratio of speed of train A to that of train B is :

1. 3 : 2

2. 1 : 4

3. 2 : 3

4. 2 : 5

Correct Answer :