2016 · Q46
Two pipes A and B can fill a tank in 60 minutes and 75 minutes respectively. There is also an outlet C. If A, B and C are opened together, the tank is full in 50 minutes. How much time will be taken by C to empty the full tank?
Elementary MathematicsTime and Work
- A100 minutes
- B110 minutes
- C120 minutes
- D125 minutes
Explanation
Let C be the emptying time in minutes: 1/60 + 1/75 − 1/C = 1/50. Then 1/C = (5+4−6)/300 = 1/100. So C empties the full tank in 100 minutes, option A.