Question 7 n the house of Proffesor Hein in Potchefstroom, is a right-angled bathtub. If the tap is fully open and the outlet is completely closed, the bath is completely filled in 20 minutes. The height of the water is than 50cm. If the outlet is open and the tap is closed, the bath flows empty in 32 minutes. On a certain day Prof. Hein likes to take a bath and opens the tap completely, but because of his absent-mindedness he forgets to close the outlet of the bath. Till what height will the water finally come