Two trains, 140 m and 160 m in length, are running towards each other on parallel lines, one at the speed of 40 km/h and the other at 50 km/h. In how much time will they be clear of each other from the moment they meet?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 12 sec
Relative speed = (40 + 50) km/hr = [ 90(5/18)] m/sec = (225/9) m/sec
Distance covered in crossing each other = (140 + 160) m = 300 m
Required time = [300( 9/225)] sec = 12 sec