AAI ATC Junior Executive 2018 Shift 1 Paper

Two trains start at the same time, one from A to B and the other from B to A. After passing each other on their way, they take 50 min and 3 h 20 min respectively to reach their respective destinations. If the speed of the train starting from A is 72 km/h, then what is the speed (in km/h) of the other train?