Question

a train running at speed 60km/hr crosses a pole in 9 sec. What is the lenght of train

Answer 1

Think of this question a little differently.

The train is moving at a speed of 60 km/hr. Let's assume ourselves to be stationary in the train. Thus we will see the pole to be moving backwards at a speed of 60 km/hr.

Now the question, actually, is stating that the time taken by the pole to cover the distance equivalent to that of the length of the train is 9 sec.

Given speed = 60 km/hr.
60 km/hr = (60*1000 m) ÷ (1*3600 s)
                  =16.666 m/s

So the pole travels 16.66 m in 1 sec. Thus the distance travelled by the pole in 9 sec (i.e., the length of the train) = 16.666*9
           =149.994 m (almost 150 m)

Hope it may help you!

Answer 2

Given :

• A train running at speed 60km/hr crosses a pole in 9 sec.

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Find :

• What is the length of train?

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Calculations :

→ 1000/60

→ 16.6

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Applying formula :

★ Length of the train = Speed × Distance.

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Further calculations :

→ 16.6667 × 9

→ 150 m [Approximately]

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Therefore, 150.003 m is the length of the train.