Emma wants to cook her husband Erwin his favorite meal, spaghetti bolognese. In addition to the delicious sauce, the consistency of the pasta is especially important. It should not be too hard, too soft, or too sticky, but "al dente", or firm when bitten. This means the noodles have to cook for exactly 11 minutes. Emma notices that her kitchen clock is broken, and only two hourglasses are on the kitchen shelf. One runs for 5 minutes and the other for 8 minutes.
How can Emma guarantee the 11-minute cooking time?
There are two solutions for this task: