Multiple choice general knowledge math & puzzles

A train, 0.25 miles long, going at a speed of 40mph enters a tunnel that is 2.25 miles long. How long does it take for all of the train to pass through the tunnel from the moment the front enters it, to the moment the rear emerges?

  1. 2 minutes 30 seconds

  2. 3 minutes 45 seconds

  3. 4 minutes 15 seconds

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total distance to clear the tunnel = Tunnel length + Train length = 2.25 + 0.25 = 2.5 miles. Time = Distance / Speed = 2.5 / 40 = 0.0625 hours. 0.0625 * 60 = 3.75 minutes (3 min 45 sec).

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