# A train travelling at 72 km per hour crosses a person standing on the platform in 20 seconds

A train travelling at 72 km per hour crosses a person standing on the platform in 20 seconds, What is the length of the train?

- 720 metres
- 400 metres
- 360 metres
- 300 metres

**Answer: (2) 400 metres **

**Solution:-**

The speed of the travelling train = 72 km/hr

Speed in m/sec = 72 x 5/18

= 20 m/sec

Time taken by train to cover a person who standing on the platform = 20 sec

Then, the length of the train = 20 x 20

= 400 metres

Hence, the correct answer is option (2) 400 metres.