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Pipe A can fill a tank in 45 minutes, and pipe B takes 50% more time than A. Together, how long do they take?

Competition practicePipes & Cisterns

A22.5 min
B30 min
C27 min
D56.25 min

Step-by-Step Solution

B takes

1.5 \times 45 = 67.5

min.

\frac{1}{45} + \frac{1}{67.5} = \frac{3 + 2}{135} = \frac{1}{27}

→ 27 min. (56.25 min is the average.)

Answer: C) 27 min

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