Question

Carol has two kinds of hourglass timers: one which runs for exactly 7 minutes, and the other which runs for exactly 11 minutes:How can Carol measure a time of exactly 15 minutes using these timers? Remember that an hourglass won’t give you a second-by-second countdown.

Answer 1

Step-by-step explanation:

Take the 11-minute hourglass and 7-minute hourglass and start their time. When the 7-minute hourglass runs out put it aside. You will have 4 minutes left in the 11-minute hourglass. That starts your 15 minutes. Let the 4 minutes run out and then turn the 11–minute hourglass over and after it empties 15 minutes will have run by.

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Answer 2

Step-by-step explanation:

Take the 11-minute hourglass and 7-minute hourglass and start their time. When the 7-minute hourglass runs out put it aside. You will have 4 minutes left in the 11-minute hourglass. That starts your 15 minutes. Let the 4 minutes run out and then turn the 11–minute hourglass over and after it empties 15 minutes will have run by.