Question

14. A 120 metres long train is moving at a speed of 30 km/hr. In how much timewill it cross 180 m long bridge ?
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Answer 1

Answer:

36secs

Step-by-step explanation:

TOTAL distance to be covered

= 120 + 180 = 300 m

speed = 30 × 5/18 = 150/18 m/s

time it will take

= 300/150/18 = 5400/150

= 36 secs

Answer 2

Answer:36

Step-by-step explanation:

The train will have to travel 120m (length of train) + 180m (length of the bridge) = 300m

If distance is 30kms (30,000m) then time taken is 1 hour (60*60=3600seconds)

If distance is 1m then time taken will be 3600/30000s

If distance is 300m then time taken will be (3600/30000)*300=36seconds

A 120 metres long train is moving at a speed of 30 km/hr will cross 180 m long bridge in 36 seconds.