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A pipe fills $\frac{2}{5}$ of a tank in 8 minutes. How long would it take to fill the whole tank?

Competition practicePipes & Cisterns

A20 min
B16 min
C3.2 min
D12 min

Step-by-Step Solution

Whole tank

= 8 \div \frac{2}{5} = 8 \times \frac{5}{2} = 20

min. (12 min is only the remaining

\frac{3}{5}

; 3.2 multiplies by

\frac{2}{5} .

)

Answer: A) 20 min

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