SOLUTION: how can one use a 3-minute timer and a 5-minute timer to measure 7 minutes?

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Question 1145146: how can one use a 3-minute timer and a 5-minute timer to measure 7 minutes?
Answer by rothauserc(4718) About Me  (Show Source):
You can put this solution on YOUR website!
1. Start both timers together
2. When the 3 minute timer runs out there are 2 minutes remaining on the 5-minute timer
3. When the 2 minutes remaining on the 5-minute timer run out, start it again