Practice30Create account

A swimming pool at a club in Bengaluru has 4 inlets that each fill it in 12 hours and 2 outlets that each empty it in 24 hours. Starting empty with all six open, how long does it take to fill?

Competition practicePipes & Cisterns
  • A3 h
  • B6 h
  • C2.4 h
  • D4 h

Step-by-Step Solution

Inlets: ; outlets: . Net → 4 h. (3 h ignores the outlets.)
Answer: D) 4 h

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

Pipe A alone fills a tank in 5 hours and pipe B alone in 8 hours. If both are opened…A pipe can fill a tank in 15 hours. Because of a leak, it fills only 3/5 of the tank in…A pipe can fill a tank in 12 hours. It worked alone for a while, then a second pipe that…Pipe A fills 8% of a tank every hour and pipe B empties 3% of it every hour. The tank is…Pipes A and B fill a tank in 20 and 30 hours, but a leak lets only 80% of the incoming…