Train A travelling at the speed of 108 km/hr completely crosses train B in 12 seconds. Train B is one third in length of train A and travelling at the speed of 90 km/hr in the opposite direction. How much time will train A take to cross a platform of length 750 m?
1
40 sec
2
43 sec
3
45 sec
4
47 sec
5
None of the above