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If a 450 meter long railway runs at a speed of 90 km/h through a tunnel, it crosses the tunnel in 1 minute 12 seconds, then what is the length of that tunnel?

If a 450 meter long railway runs at a speed of 90 km/h through a tunnel, it crosses the tunnel in 1 minute 12 seconds, then what is the length of that tunnel? Correct Answer 1350 m.

Given:

The length of the train is 450 meter

Concept:

Speed = Distance/Time

Calculation:

Let be assume length of the tunnel is p

⇒ 1 minute 12 seconds =(450 + p)/{90 × (5/18)}

⇒ 72 seconds =  = (450 + p)/25

⇒ p = 1350 m

∴ The required result will be 1350 m.

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