Ankita is two years younger than Anu. After four years from today, Anu's age will be two times of Ankita's age three years ago. Find the present age of Ankita and Anu.
A tank can be filled with a tap in 10 hours. However it takes 11 hours to fill the tank due to a leak. The tap is closed when the tank is full. How many hours will the tank take to empty due to leakage?