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An inlet fills a cistern in 2 hours. What fraction of the cistern does it fill in 50 minutes?

Competition practicePipes & Cisterns

A $\frac{2}{5}$
B $\frac{5}{12}$
C $\frac{1}{4}$
D $\frac{7}{12}$

Step-by-Step Solution

2 hours

= 120

min, so in 50 min it fills

\frac{50}{120} = \frac{5}{12} . (\frac{7}{12}

is the part still empty.)

Answer: B)

\frac{5}{12}

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