c. How much longer does Sana spend in the bathroom than Ali ? Mother Showers, washes and dries hair, brushes teeth ¾ hour Father Showers, shaves, brushes teeth 50 minutes Ali Showers, brushes teeth 20 minutes Sana Takes a bath, brushes teeth ½ hour Grand father Showers, shaves 35 minutes Grand mother Takes a bath, brushes teeth 40 minutes