Egg timers

How can you measure 15 minutes using only a 7-minute egg timer and an 11-minute egg timer?

Answer

Start both timers simultaneously.

When the 7 minute timer ends, there is 4 minutes remaining on the 11 minute timer.

Your 15 minute period begins with the end of the 7 minute timer

When the 11 minute timer ends restart it, when it ends for the 2nd time, you have reached 15 minutes.

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