2012 · Q84
There are two taps A and B to fill up a water tank. The tank can be filled in 40 minutes if both taps are on. The same tank can be filled in 60 minutes if tap A alone is on. How much time will tap B alone take to fill up the same tank?
Elementary MathematicsArithmetic
- A64 minutes
- B80 minutes
- C96 minutes
- D120 minutes
Explanation
1/40 - 1/60 = 1/120, so B alone takes 120 minutes.