arithmetic - two trains are running in opposite directions with the same speed if the length of each train is 250 metres and they cross each other in 10 sec then the speed of each train in kmhr is - skillgun

Let the speed of each train be x m/sec.
Vr = 2x m/sec.
So, 2x = (250 + 250)/10
= 500/10
=> x = 500/20 = 25 m/sec.
.'. Speed of the first train = 25 m/sec
= 25 * 18/5
= 90 km/hr.