#9 Start both glasses. When the 7 runs out put the egg in the water. When the 11 runs out (after 4 more minutes) start the 11 again. When it runs out the egg is boiled for 15 minutes.
#9 Start both glasses. When the 7 runs out put the egg in the water. When the 11 runs out (after 4 more minutes) start the 11 again. When it runs out the egg is boiled for 15 minutes.