- A19.5
- B52
- C26
- D18
Step-by-Step Solution
Combined rate = 1/26 + 1/78 = 3/78 + 1/78 = 4/78 per hour, so time = 78/4 = 19.5 hours.
Answer: A) 19.5
A municipal tank is filled by pipe A in 26 hours and by pipe B in 78 hours. If both pipes run together, how many hours will it take to fill the tank?
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 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…A can do a piece of work in 12 days and B in 6 days. Working together, in how many days…Rekha can whitewash a hall alone in 34 days, while Sunil needs 51 days. If they work…Ramesh can paint a wall in 10 days and Suresh can paint it in 15 days. Working together,…