Question

The train is moving at the speed 108km/hr. what is the length of the train, when it crosses the electric post in 36 seconds?​

Answer 1

Answer:

1080 meters.

Step-by-step explanation:

The train is moving at a speed of 108 km/hr and crosses an electric post in 36 seconds. Since the second value is in seconds it's better to convert 108 km/hr into meter/secs.  This is done as follows

108 x 5/18 = 30 meter/seconds.  (You can also remember that 36km/he is 10 m/s so 108 km/r which is 36x3 will be equal to 10x3 i.e 30 m/s)

The length of the pole is not given and is considered as negligible in front of the train. This means the train covers it's whole length which is required to cross the pole completely in 36 seconds at a speed of 30 m/s

i.e. 36x30 = 1080 meters