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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.

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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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