Question

A 150 m long train is moving with a uniform

velocity of 45 km/h. The time taken by the train
to cross a bridge of length 850 metres is​

Answer 1

80sec

Step-by-step explanation:

Velocity = Displacement/Time.

The train is moving with a uniform velocity of 45km/h means the train is moving 45km in 1 hour.

The relation between km/hour and m/sec is

1km/hour=

10003600m/sec=518m/sec

Then 45km/hour =518×45=252m/sec

Thus the train is moving 252m

in 1 second

The train is moving 1m in 1252

second

The train is moving 1000m in 1252×1000

second

=1×225×1000sec=2×40sec=80sec

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