To fill a cistern, pipes A, B and C take 15 minutes, 12 minute and 10 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern is:
(A)
5 min
(B)
7 min
(C)
4 min
(D)
6 min
Answer: (C)
Explanation:
A can do a piece of work in x minutes
B can do a piece of work in y minutes
C can do a piece of work in z minutes
Minute’s work of each of the three is 1/x +1/y + 1/z
1 minutes work of each of the three pipes = 1/15 + 1/12 + 1/10
= 1/4 or = 4 minutes
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