2014 · Q1
Pipe A can fill a tank in 3 hours. But there is a leakage also, due to which it takes 3.5 hours for the tank to be filled. How much time will the leakage take in emptying the tank if the tank is filled initially?
Elementary MathematicsTime and Work
- A21 hours
- B20 hours
- C18 hours
- D10.5 hours
Explanation
Net filling rate = 1/3.5 − ... : 1/3 − 1/x = 1/3.5 = 2/7, so 1/x = 1/3 − 2/7 = 1/21, giving x = 21 hours.