- A4
- B8
- C5
- D6
Step-by-Step Solution
Combined rate = 1/10 + 1/15 + 1/30 = (3 + 2 + 1)/30 = 6/30 = 1/5 tank per hour, so the tank fills in 5 hours.
Answer: C) 5
Three pipes can fill a tank in 10, 15 and 30 hours respectively. If all three are opened together, in how many hours will the tank be filled?
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 work in 15 days and B in 20 days. They work together for 6 days, after which…A is twice as efficient as B. Working together they complete a work in 8 days. How many…6 women can complete a work in 18 days. 3 women start the work, and after 6 days 3 more…Two inlet pipes feed a village water tank. The first can fill it alone in 9 hours and…A hose fills an aquarium in 4 hours, but a crack in the glass drains a full aquarium in…