# In what time will they cross each other?

Two trains of lengths 150 m and respectively are running in opposite directions on parallel tracks. If their speeds be 50 km/hr and 58 km/hr respectively, in what time will they cross eachother?

- 15 seconds
- 30 seconds
- 11 seconds
- 22 seconds

**Answer is 11 seconds**

**Explanation:-**

Let the time taken by two trains to cross each other be X sec.

The speed of one train in m/sec = 50 x 5/18

= 13.88 m/sec

The speed of another train in m/sec = 58 x 5/18

= 16.11 m/sec

Time taken by trains to cross each other = (150 + 150)/(13.88 + 16.11)

= 300/29.99

= 10.003 sec

Hence, the correct answer is (3) 11 sec (Approximate)