The Ant Line

100 ants are on a 1-meter stick, each walking left or right at 1 cm/s. When two ants collide, they reverse direction. How long until all ants fall off?

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Quick Answer & Explanation

100 seconds maximum. Colliding

The answer to this riddle is 100 seconds maximum. Colliding. Difficulty: Hard · Solved by 9,493 puzzle lovers.

100 seconds maximum. Colliding ants reversing is equivalent to ants passing through each other. The furthest ant from an edge is at most 100 cm away.

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