Question

A train 360 m long is running at a speed of 45km/hr. What time will it take to cross a 140 m long bridge?

a) 20 sec

b) 30 sec

c) 40 sec

d) 50 sec

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Answer 1

Explanation:

During crossing a bridge a train has to cover its length as well as the length of bridge.

So total distance to be covered=(360+140) m

=500m

45km=45000m

1hr=3600 sec

45000 m is covered in =3600 sec

1m is covered in = 3600÷45000 sec

500 m is covered in = 3600÷45000 ×500 sec

= 40 sec