Two trains 110 m and 140 m long run at the speed of 60 km/hr and 70 km/hr respectively in opposite directions on parallel tracks. The time which they take to cross each other, is
1
2 seconds
2
7 seconds
3
12 seconds
4
17 seconds
Two trains 110 m and 140 m long run at the speed of 60 km/hr and 70 km/hr respectively in opposite directions on parallel tracks. The time which they take to cross each other, is