# Thread: Time To Fill Pool

1. ## Time To Fill Pool

An empty pool being filled with water at a constant rate takes 8 hours to fill to 3/5 of its capacity. How much more time will it take to finish filing the pool?

My Work:

Let t = time (in hours)

1 - 3/5 = 2/5

8/t = (3/5)/(2/5)

Solving for t, I got 5.3333333333, which of course I rounded to two decimal places for a final answer of 5 hours and 30 minutes.

The book's answer is 5 hours and 20 minutes.

Why am I wrong? Is my proportion set up incorrect?

2. ## Re: Time To Fill Pool

Originally Posted by harpazo
Solving for t, I got 5.3333333333, which of course I rounded
to two decimal places for a final answer of 5 hours and 30 minutes.

The book's answer is 5 hours and 20 minutes.

Why am I wrong? Is my proportion set up incorrect?
5.333333333 = 5 1/3 = 5 hr 20 min

3. ## Re: Time To Fill Pool

But harpazo didn't get "5 hr 20 min". That is what he said was the "book answer". He got 5 hours and 30 min. Harapazo, there are 60 min in an hour, not 90!

4. ## Re: Time To Fill Pool

Whoopsee do....gimmee back that pink star!!

5. ## Re: Time To Fill Pool

Pink Star? Pattrick? Ditto?

6. ## Re: Time To Fill Pool

Mr.Fly, you sound ready for the Suck o Harjo Asylum!

7. ## Re: Time To Fill Pool

Originally Posted by HallsofIvy
But harpazo didn't get "5 hr 20 min". That is what he said was the "book answer". He got 5 hours and 30 min. Harapazo, there are 60 min in an hour, not 90!
Yes, I know there are 60 minutes in one hour. I have no idea where my head was on the day I tackled this problem. The only excuse I have is mental/physical tiredness. You see, I work 40 overnight hours. When I get home from work, it is the only time (in addition to my 2 days off) to practice and review mathematics. It is really hard to concentrate on anything much less math word problems after giving up my sleep time to make money. I look like a zombie after working 12am to 8am Thursday through Monday. This is my only excuse.