Question

A train 300 meters long and travelling at a speed of 72 km/h will cross a pole in ​

Answer 1

Answer:

15 seconds

Step-by-step explanation:

Distance = 300m

Speed = 72kmph = 72 x 5/18 = 20 m/s

Time = ?

Speed = Distance / Time

20 = 300/ T

T = 300/ 20

T = 15 seconds

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Answer 2

Answer:

A train is 300 metres long and is travelling at a speed of 72 kilometre / hour

The train is crossing the pole, in such case the pole is stationary, while the total speed will be of the train.

Train speed = 72 km/hr = 72000 metres / 3600 seconds

Train speed = 720/36 metre per second = 20 m/s

Distance = 300 metres.

N.B. The train has to cover the distance only equivalent to its length, since train has to pass the pole completely i.e. from the approaching of engine to the pole, than entire train length passing the pole, till it's last bogey crosses the pole.

Now we know, Time = Distance/Speed

Hence Time = 300 meter / 20 meter per second = 15 seconds

The train will cross the pole in 15 seconds

Step-by-step explanation:

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