Two trains running at 63 kmph and 45 kmph cross each other in 15 seconds when they run in opposite direction. When they run in same direction, a person in the faster train observes that he crossed the other train in 40 seconds. Find the length of two trains
Since the trains are going in opposite directions, their speed in relation to each other is the total of their two speeds. 63 + 45 = 108 kmh.
We'll need to do some conversion here. 1 kilometer = 1000 meters, and 1 hr = 3600 seconds.
108 kilometers = 108,000 meters
1 hour = 3600 seconds
108 km/h = 108,000m/3600s = 30 meters per second
So in 15 seconds, the trains cover 30 x 15 = 450 meters.
