To fill a cistern, pipes P, Q & R take 20, 15 & 12 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern is:__________?

To fill a cistern, pipes P, Q & R take 20, 15 & 12 minutes respectivel

1.	To fill a cistern, pipes P, Q & R take 20, 15 & 12 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern is:__________?
A.	5 min
B.	10 min
C.	15 min
D.	20 min
Answer» B. 10 min

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To fill a cistern, pipes P, Q & R take 20, 15 & 12 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern is:__________?

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