- A12 h
- B
- C7 h
- D8 h
Step-by-Step Solution
One inlet does a third of the work per hour, so it needs three times as long: h.
Answer: A) 12 h
Three identical inlets together fill a tank in 4 hours. How long would one of them take alone?
Competition practicePipes & Cisterns
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 Pipes & Cisterns practice questions
More Pipes & Cisterns practice
Ramesh switches on a motor that fills his 1,000-litre rooftop tank in 25 minutes. How…With the inlet and the leak in the figure both open, how long does the empty tank take…A tank is filled in 2 hours 24 minutes by two pipes working together. If one pipe alone…The table gives the litres per minute that each of three pumps can lift. Pumps 1 and 3…The tank in the figure holds 1,800 litres and is empty. Both pipes are opened together.…