How would you do to time 9 minutes with a 4 minute hourglass and a 7 minute hourglass?
To time 9 minutes with a 4-minute hourglass and a 7-minute hourglass, follow these steps:
- Flip both hourglasses.
- When the 4-minute hourglass runs out, immediately flip it over.
- When the 7-minute hourglass runs out, flip the 4-minute hourglass over again.
- When the 4-minute hourglass runs out for the second time, 9 minutes have elapsed.
Additional tips:
- Use a stopwatch to ensure accuracy.
- Practice the steps before attempting to time accurately.
- Take into account the time it takes to flip the hourglasses.
Related questions and answers:
- How many times will the 4-minute hourglass be flipped? Answer: 3 times
- What will happen when the 7-minute hourglass runs out for the second time? Answer: It will have elapsed 14 minutes
- Can this method be used to time any number of minutes? Answer: Yes, but it becomes more complex for longer durations
- What is the purpose of using two hourglasses? Answer: To create a time interval longer than the duration of either hourglass
- What are some real-world applications of this technique? Answer: Timing cooking, workouts, or meetings
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