Three pipes, A, B, C can fill an empty cistern in 2, 3 and 6 hours res – McqOptions

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1.	Three pipes, A, B, C can fill an empty cistern in 2, 3 and 6 hours respectively. They are opened together. After what time should B be closed, so that the cistern gets filled in exactly 1 hr 15 min?
A.	20 min
B.	30 min
C.	15 min
D.	45 min
Answer» C. 15 min

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