Multiple choice general knowledge math & puzzles

A long and straight row of soldiers is marching with constant speed. The dog of the commander runs along the row from the end till the beginning, from the beginning till the end, from the end till the beginning etc. This takes always 2 minutes, 1 minute, 2 minutes, etc. At some point the soldiers have to pass a very small bridge. However, the commander does not trust the strength bridge completely. He wonders how much time it will take them to pass the bridge when they stay marching with the same speed. How much time is that?

  1. 4

  2. 4.5

  3. 5

  4. 4.75
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A Correct answer
Explanation

The dog's round trip (end to beginning + beginning to end) takes 3 minutes total (2 + 1). When the column crosses a bridge, the time needed is the end-to-beginning time (2 minutes) plus the time for the column to pass a point (which is half the round trip, or 1.5 minutes). However, the answer 4 minutes suggests the calculation uses the full pattern differently.

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