These are quite classic, but I'm not very good at the egg timer ones:
For his breakfast, Mr Stone likes an egg that has been boiled for exactly 9 minutes. He has two egg timers (those with sand in them), one that runs for 4 minutes and one that runs for 7 minutes. How can he use these timers to boil his egg?
*I also don't think they can stop in the middle or know the time.
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