- A6 h (it fills)
- B18 h (it empties)
- C2 2/5 h (it empties)
- D12 h (it empties)
Step-by-Step Solution
C empties faster than A fills: net emptying per hour. Water present , so time h, and the tank empties.
Answer: D) 12 h (it empties)
The tank is two-thirds full when inlet A and outlet C are both opened, as shown. What happens to the tank, and how long does it take?
Class 8Pipes and CisternsDirect and Inverse Proportions
Master this chapter in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Pipes and Cisterns practice questions
More Class 8 Pipes and Cisterns practice
Both taps on the empty tank are opened together. After 3 hours tap A is turned off and…A pipe can fill a tank in 12 hours. Another pipe can empty it in 18 hours. If both are…A leak can empty a full tank in 10 hours. A tap filling 4 litres a minute is opened; now…Pipe A fills a tank in 16 minutes and pipe B in 24 minutes. They are opened alternately…A pipe fills a tank in 6 hours. After filling half, a leak starts and the rest takes 4…