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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.

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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Invert both hour glasses at the same time. Start when the two-minute hour glass finishes. Stop when the five-minute hours glass finishes.

A measure of time, somewhat shorter than 1 minute. Or an angle.

A light-minute is a measure of distance, not time. A light-minute is the distance light travels in a vacuum in one minute. Approximately 11,160,000 miles (18,000,000 km)

No number of meters equals one minute, unless possibly minutes of longitude are meant. Normally, minutes measure time and meter measures distance, which are incommensurable (incompatible) categories.

1560/24 = 65 minutes

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Invert both hour glasses at the same time. Start when the two-minute hour glass finishes. Stop when the five-minute hours glass finishes.

A measure of time, somewhat shorter than 1 minute. Or an angle.

A light-minute is a measure of distance. It is the distance light travels in one minute's time. One light-minute is a distance of about 11,176,943.82 miles.

Light minutes is a measure of distance, not of time. It is not possible to transfer a measure of distance into one of time. Otherwise you'd be able to figure out how many minutes high your house is, and how many miles of sleep you had last night.

"Minutes" (a measure of time equal to 60 standard seconds) is pronounced "MIN-itz".

The plural of minute is minutes.

A light-minute is a measure of distance, not time. A light-minute is the distance light travels in a vacuum in one minute. Approximately 11,160,000 miles (18,000,000 km)

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.

4 whole minutes and 4/5 of another one.

No number of meters equals one minute, unless possibly minutes of longitude are meant. Normally, minutes measure time and meter measures distance, which are incommensurable (incompatible) categories.

Sixty Minutes in a Degree. A "minute" is a unit of angular measure used in astronomy.

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