Question

Pipe P can fill 4/9 part of a tank in 28 hours and pipe Q can fill 3/5 part of the same tank in 27 hours. Both P and Q were kept open for 3 hours, then both were closed. Pipe R alone was then opened and it emptied the water in the tank in 8 hours. Pipes P, Q and R together can fill the empty tank in:

• A. 51 hours
• B. 57 hours
• C. 40 hours
• D. 42 hours

Answer 1

Answer:

D. 42 hours

42 hours