Find Out the Speed of Each Train (in kmph):
Answer: (1) 72 km/hr
Let the speed of the train be X m/sec
The speed of the train = (sum of the length of the train )/ time taken by train to cross each-other
Then, the speed of the train = (120 + 120 )/12 (The length of both trains are equal )
= 20 m/sec
Speed in km/hr = 20 x 18/5
= 4 x 18
= 72 km/hr
Then, the speed of each train is 72 km/hr.
Hence, the answer is (1) 72 km/hr.