Two trains coming from opposite direction and running respectively at 24km/h and 48km/h cross each other in 11sec. What is the length of each train if the two trains are equal?
The trains cover a distance equal to the sum of their lengths at a relative speed 24 + 48 = 72km/h × (5/18), or 20m/s. We can use the speed distance formula: sum of lengths = 20 × 11 = 220m. Halving this we get the length of one train = 110m.