A train is running at the speed of 50 km/hr from A to B at 8 am. At the same time another train is running from B to A at the speed of 40 km/hr. If they are running on parallel tracks and the distance between two stations is 270 km, then at what time will they start to cross each other?

11.00 am

Distance b/w two station = 270 km

Relative speed in opposite direction = 50 + 40 = 90 km/hr

Time = \(\frac{distance}{relative\;speed}\) = \(\frac{270}{90}\) = 3 hours

Train will start to cross each other at = 8 + 3 = 11:00 am