- A16
- B7.5
- C8
- D6
Step-by-Step Solution
Together per minute: 1/12 + 1/20 = 5/60 + 3/60 = 8/60 = 2/15, so 15/2 = 7.5 minutes.
Answer: B) 7.5
Inlet A alone fills a sump in 12 minutes; inlet B alone takes 20 minutes. With both inlets open, in how many minutes is the sump full?
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
An overhead tank has two inlet pipes that fill it in 15 hours and 21 hours respectively.…Sunita can finish a piece of work in 27 days, and Kamla can finish the same work in 54…A municipal tank is filled by pipe A in 26 hours and by pipe B in 78 hours. If both…A can do a work in 12 days and B in 18 days. They work together for 4 days, then A…An inlet pipe can fill a tank in 12 hours, while an outlet pipe can empty the full tank…