- A26
- B58.5
- C39
- D13
Step-by-Step Solution
Combined rate = 1/39 + 1/78 = 2/78 + 1/78 = 3/78 = 1/26 of the sump per hour, so it fills in 26 hours.
Answer: A) 26
How many hours will a large school sump take to fill if two taps feed it together, one able to fill it alone in 39 hours and the other in 78 hours?
Competition practiceTime & Work / Pipes
Master this topic in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Time & Work / Pipes practice questions
More Time & Work / Pipes practice
A can do a piece of work in 24 days. He works alone for 6 days, then B joins him and…Pipe P fills a tank in 11 hours and pipe Q fills it in 33 hours. With both open, in how…An inlet pipe can fill a cistern in 14 hours, but a crack at the bottom can drain the…Two taps fill a school's water tank in 21 hours and 42 hours respectively. Opened…Two painters, Salim and Deepak, take 36 days and 60 days respectively to paint a school…