# Find Out the Speed of Each Train (in kmph):

Two trains are running in opposite directions with the same speed. If the length of each train is 120 metre and they cross each other in 12 seconds, then the speed of each train (in kmph) is:

- 72
- 36
- 18
- None of these

**Answer: (1) 72 km/hr**

**Explanation:-**

Let the speed of the train be X m/sec

**Formula-**

**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 )

= 240/12

= 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.