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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?1. 1000 m.2. 1350 m.3. 360 m.4. 750 m. |
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Answer» Correct Answer - Option 2 : 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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