[Food Safety Officer, 2020]

3. Two pipes A and B can fill a tank in 20 and 30 hours respectively, both the pipes are opened to fill the tank but when the tank is one-third full, a leak develops in the tank through which one-third water supplied by both the pipes goes out. The total time taken to fill the tank is:

1. 12 hours

2. 14 hours

3. 16 hours

4. 18 hours

Correct Answer :

16 hours