Multiple choice general knowledge

There is a train one kilometer long, traveling at a rate of one kilometer per minute through a tunnel which is one kilometer long. How long will it take the train to pass?

  1. 1 min

  2. 2 min

  3. 3 min

  4. 4 min
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For a train to completely pass through a tunnel, it must travel its own length plus the tunnel length. Train = 1 km, tunnel = 1 km, so total distance = 2 km. At 1 km/min speed, time = distance/speed = 2/1 = 2 minutes. The train's front enters at t=0 and the rear exits at t=2.

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