arithmetic - two trains are running in opposite directions in the same speed the length of each train is 120 meter if they cross each other in 12 seconds the speed of each train in kmhr is - skillgun

Distance covered = 120+120 = 240 m
Time = 12 s
Let the speed of each train = v. Then relative speed = v+v = 2v
2v = distance/time = 240/12 = 20 m/s
Speed of each train = v = 20/2 = 10 m/s
= 10×36/10 km/hr = 36 km/hr