Question

A train 200 metres long and travelling at a speed of 60 km / h will cross a pole in (1) 5sec (2) 6 sec (3) 12 sec (4) 20 sec

Answer 1

Answer 12 sec

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Explanation attached

Answer 2

Given :

A train 200 metres long and travelling at a speed of 60 km / h will cross a pole

To Find :

Time taken

Solution:

Length of train = 200 m

Speed of train = 60 km/hr

1 km =1000 m

1 hour = 3600 sec

So,Speed of train = $60 \times \frac{1000}{3600}=\frac{50}{3}$

We are supposed to find the time taken to cross the pole

So,$Time = \frac{Distance}{Speed}$

$Time = \frac{200}{\frac{50}{3}}$

Time =12

Hence It will take 12 seconds to cross a pole.