6 pipes fill a tank in 120 minutes, then 5 pipes will fill it in

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100 min

144 min

108 min

140 min

answer is B.

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Detailed Solution

Number of pipes	Time
X₁=6	y₁=120 min
x₂=5	y_{2 =}?

In the indirect proportion
$= \frac{x_{1}}{x_{2}} = \frac{y_{2}}{y_{1}} \Rightarrow \frac{6}{5} = \frac{y_{2}}{120} \Rightarrow y_{2} = \frac{120 \times 6}{5} = 144 \min .$

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