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A man observes a train passing over a bridge 1 km long. The length of the train is half that of bridge. If train clears the bridge in 2 minutes, find the speed of the train.
  • a)
    50 km/h
  • b)
    30 km/h
  • c)
    45 km/h
  • d)
    60 km/h
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A man observes a train passing over a bridge 1 km long. The length of...
Given:
Length of bridge (l) = 1 km
Length of train (l') = 1/2 km = 0.5 km
Time taken by train to cross the bridge (t) = 2 minutes = (2 / 60) hour = (1 / 30) hour.
Concept used:
Speed of train = (length of bridge + length of train) / time
Calculation:
Speed of train
=
= 1.5 × 30
= 45 km/hr.
∴ Speed of train is 45 km/hr.
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