Two pipes, A and B can fill an empty cistern in 20 min and 40 min, res – McqOptions

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1.	Two pipes, A and B can fill an empty cistern in 20 min and 40 min, respectively. Both the pipes are opened together, and after some time, pipe A is closed. If the cistern gets filled in 30 min, then for how long was pipe A kept open?
A.	5 min
B.	15 min
C.	10 min
D.	2 min
Answer» B. 15 min

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