2015 · Q17
A and B are two taps which can fill a tank individually in 10 minutes and 20 minutes respectively. However, there is a leakage at the bottom, which can empty a filled tank in 40 minutes. If the tank is empty initially, how much time will both the taps take to fill the tank with leakage ?
Elementary MathematicsSimple and Compound Interest
- A2 minutes
- B4 minutes
- C5 minutes
- D8 minutes
Explanation
Net filling rate = 1/10 + 1/20 - 1/40 = 1/8 of the tank per minute, so the tank fills in 8 minutes. Hence option (d).