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

Correct option is C

Given:
Length of the train = 180 m
Speed of the train = 90 km/h
Formula Used:
Time taken to pass the post $$T = \frac{\text{Length of the train}}{\text{Speed of the train}}$$​​
Solution:
Speed of the train in meters per second$$= 90 \times \frac{1000}{3600} = 25 \text{ m/s}$$​​
Time taken $$T = \frac{180}{25} = 7.2 \text{ seconds}$$​​