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Two pipes fill a 900-litre tank in 15 and 30 minutes respectively. When both fill the empty tank together, how many litres come from the faster pipe?

Competition practicePipes & Cisterns

A900 L
B600 L
C300 L
D450 L

Step-by-Step Solution

Together they take

\frac{1}{\frac{1}{15} + \frac{1}{30}} = 10

min. The faster pipe gives

\frac{900}{15} = 60

L/min, i.e.

60 \times 10 = 600

L. (450 L splits the water equally.)

Answer: B) 600 L

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