### The Two Hourglasses

You have only two hourglasses. The first one times exactly 7 minutes, the other times exactly 11 minutes.

Using just these two hourglasses and nothing else, how would you accurately time 15 minutes?

You have only two hourglasses. The first one times exactly 7 minutes, the other times exactly 11 minutes.

Using just these two hourglasses and nothing else, how would you accurately time 15 minutes?