# How Long will Train Take to Pass a Post? If

A train 180 mts long is running at a speed of 90 km/h. How long will it take to pass a post?

- 7.8 sec.
- 8 sec
- 7.2 sec
- 8.2 sec

**Answer: (3) 7.2 sec**

**Explanation:- **The length of the train = 180 m

The speed of the train = 90 km/hr

Then, the speed of the train in m/sec = 90 x 5/18

= 5 x 5

= 25 m/sec

Time taken by train to pass a post = 180/25

= 7.2 sec.

Hence, the answer is (3) 7.2 sec