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If pipe A alone is opened, the tank will be filled in 6 minutes. If pipe B alone is opened, the tank wil emptied in 9 minutes. If both are opened together, in how many minutes will the tank be filled?

A15

B3

C18

D27

Answer:

C. 18

Read Explanation:

Total capacity of tank = LCM[6, 9] = 36 Efficiency of A = 36/6 = 6 Efficiency of B = 36/-9 = -4 Efficiency of A and B = 6 + -4 = 2 Time taken by both the pipes to fill the tank = 36/2 = 18 minute


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