Shane has to fill a water tank in 3 hours 40 minutes and he used 7 pipes for th

Question

Shane has to fill a water tank in 3 hours 40 minutes and he used 7 pipes for that. How many pipes should he use to fill the tank in 1 hour 21 minutes?

Options:

A . 21 pipes

B . 19 pipes

C . 7 pipes

D . 30 pipes

Answer: Option B
:
B
Let the number of pipes be y.

\begin{matrix} Number of pipes & 7 & y Time (in minutes) & 220 & 81 \end{matrix}

Shane Has To Fill A Water Tank in 3 Hours 40 Minutes And He...

The number of pipesand the timeare inversely proportional.
AB = constant

A_{1} \times B_{1}

A_{2} \times B_{2}

\frac{7}{y}

\frac{81}{220}

\Rightarrow y = \frac{7 \times 220}{81} = 19.01 \approx 19

Shane has to use 19 pipes to fill the tank in 1 hour 21 minutes.

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