One tube fills the pool in 15 hours. How many hours and minutes will it take to fill the pool with 4 same type tubes?

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Answer 1 · 2018-06-26T11:27:43

$color(blue)(3 " hrs " 45 " minutes"$

This is a case of inverse variation:

For inverse variation, we have:

$y prop k/x^n$

Where $bbk$ is the constant of variation.

We need to find this constant $bbk$

Let $y$ be the number of hours taken. Let $x$ be the number of tubes.

$y=15$ and $x=1$

$:.$

$15=k/1$

$k=15$

Now if we have 4 tubes:

$x=4$

$y=15/4=3 3/4$ hrs

or:

$3 " hrs " 45 " minutes"$