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A 1-kilometre long train passes through a tunnel of 2-kilometre length at a speed of 1 kilometre per minute. How much time will it take to pass through it completely (the last part of the train to be out of the tunnel)?

A 1-kilometre long train passes through a tunnel of 2-kilometre length at a speed of 1 kilometre per minute. How much time will it take to pass through it completely (the last part of the train to be out of the tunnel)? Correct Answer 3 minutes

Given:

Length of the train = 1km = 1000m

Length of the tunnel = 2km = 2000m

Speed of the train = 1km/min. = (1000/60)m/sec

Formula used:

Distance = Speed × time

Calculation:

Distance = length of the train + length of the tunnel

Distance = 1000 + 2000 = 3000m

Time = {(3000/(1000/60)}

⇒ Time = 180sec

∴ the required time = 180sec = 3min

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