Three pipes A, B and C can fill a cistern in 10 12 and 15 h, respectiv – McqOptions

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1.	Three pipes A, B and C can fill a cistern in 10 12 and 15 h, respectively while working alone. If all the three pipes are opened together, then find the time taken to fill the cistern.
A.	3 h
B.	4 h
C.	5 h
D.	6 h
Answer» C. 5 h

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