A train is running at a speed of 40 km/hr and it crosses a post in 18 seconds. What is the length of the train?  Choices:
A) metres
B) metres
C) metres
D) metres
E) metres
Explanation:   Speed of the train, v = 40 km/hr = 40000/3600 m/s = 400/36 m/s   Time taken to cross, t = 18 s   Distance metresovered, d = vt = (400/36)× 18 = 200 m   Distance covered is equal to the length of the train = 200 m   Answer: Option metres
<result>C</result>
A train is running at a speed of 40 km/hr and it crosses a post in 18 seconds. What is the length of the train?