Question

When operated separately, pipe A takes 5 hours less than pipe B to fill a cistern, and when both pipes are operated together, the cistern gets filled in 6 hours. In how much time (in hours) will pipe B fill the cistern, if operated separately-

• A. 15 hours
• B. 18 hours
• C. 10 hours
• D. 9 hours

Answer 1

Answer: (A)