Two trains are travelling in opposite direction. one of these id 500m long having a speed of 120km/hr while other is 100m long having a speed of 60km/h. in what time do these cross each other?
the total passing speed is 180 km/hr
the distance is 600 m = 0.6 km
so t = d/s = .6 /180 = 1/300 hour
(1 hr/300) * 3600 s /hr = 12 seconds