Multiple choice

A train 540 meters long is running with a speed of 54 kmph. The time taken by it to cross a tunnel 180 meters long is?

  1. 48 sec

  2. 44 sec

  3. 52 sec

  4. 40 sec
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A Correct answer
Explanation

Total distance = 540m + 180m = 720m. Speed = 54 km/hr = 54 * (5/18) = 15 m/s. Time = 720 / 15 = 48 seconds.

AI explanation

The total distance to cross the tunnel is the length of the train plus the length of the tunnel: 540 m + 180 m = 720 m. Convert the speed of 54 kmph to m/sec by applying the conversion factor 5/18, resulting in 54 * 5/18 = 15 m/sec. The time taken is calculated by dividing the total distance by the speed, so 720 / 15 = 48 sec.

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