Question

this pool measures 7m long by 4m wide and is 1.2 m deep when full. To fill the pool, a hose delivers 20 L per minute is placed in the pool. how long will it take to fill the pool to its proper depth, starting from empty?​

Answer 1

We need to find the volume first.

We will use our famous volume of a rectangular solid formula:

V = l x w x h

So, V = 12 x 7 x 1.2 = 100.8 cubic meters.

Now, cost = 100.8 x 27.25 = 2746.8 PHP

Conclusion:The water will cost PHP 2,746.8.

Answer 2

Answer: 28 hours

Explanation:

`V=7(4)(1.2)\\\\v=33.6\ m^3`

`\displaystyle\\20\ l/min=\\\\(20(60))/(1000) =\\\\(1200)/(1000)=\\\\1.2\ m^3/hour`

`\displaystyle\\v=(V)/(t) \\`

Multiply both parts of the equation by t(t≠0):

`vt=V`

Divide both parts of the equation by v (v≠0):

`\displaystyle\\t=(V)/(v) \\\\t=(33.6)/(1.2) \\\\t=28 \ hours`