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# If you have two sand glasses One of them is for the 4 minute another one - is for 7 minutes If you have to measure 9 minutes with these two sand glasses in 9 minutes?

Updated: 12/24/2022

Wiki User

14y ago

At 0 minutes, turn both the hourglasses.

After 4 minutes:

The 4 minute hourglass: 0 minutes left.

The 7 minute hourglass: 3 minutes left.

Turn the 4 minute hourglass.

After 7 minutes:

The 4 minute hourglass: 1 minute left.

The 7 minute hourglass: 0 minutes left.

Turn the 7 minute hourglass.

After 8 minutes:

The 4 minute hourglass: 0 minutes left.

The 7 minute hourglass: 1 minute left.

Turn the 7 minute hourglass.

After 9 minutes:

The 4 minute hourglass: 0 minute left.

The 7 minute hourglass: 0 minutes left.

Now you know you are finished.

Wiki User

14y ago

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Q: If you have two sand glasses One of them is for the 4 minute another one - is for 7 minutes If you have to measure 9 minutes with these two sand glasses in 9 minutes?
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Start both timers, when the four minute timer is done, there will be 3 minutes of sand left in the top of the seven minute timer.Restart the four minute timer, while letting the remaining (3 minutes) of sand to drop from the 7 minute timer. (this is your 1st 3 minutes of your nine minute measurement)When the 7 minute timer is done the 4 minute timer will now have 3 minutes of sand in the bottom. Flip the 4 minute timer (when this runs it will be your second 3 minutes of time). At the same time flip the 7 minute timer.When the 3 minutes of sand run on the 4 minute timer, restart the 7 minute timer by this time 3 minutes worth of sand will have gone to the bottom of the timer, resetting it will give you the last 3 minutes of sand for you last 3 minutes of time measuring the 9 nine minutes.

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