1.

A tank can be filled by two taps X and Y in 18 and 30 minutes respectively. If tap X stops working when the tank is half-full, then what is the total time that the tank will take to fill?

A. \(20\frac{5}{8}\)
B. \(11\frac{1}{4}\)
C. \(16\frac{1}{4}\)
D. \(5\frac{5}{8}\)
Answer» B. \(11\frac{1}{4}\)


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