Cannibals

Imagine yourself in this situatuion and how are you going to overcome this problem.

• You are ship wrecked and captured by cannibals.
• Two hour glasses are thrust into your hands.
• One measures exactly four minutes.
• The other measures exactly seven minutes.
• The chief cannibal says you must tell when exactly nine minutes have passed.
• If you can do this, you are free.
• If you can't, you are dinner.
• The chief yells, " Start now ."
• What do you do?

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