Amount in Gallons

Start by converting mph into feet per second. Your width times depth result would then be multiplied by the number of seconds in five minutes. Do you follow?

This will give you cubic feet, you must then convert to gallons.

Yes, I follow you.

Ok.

4.5 mph = 6.6 fps.

5 min. = 18000 sec.

18000 x 3456 = 62208000 cu. ft.

62208000 cu. ft. x 7.48 gal. = 465315840 gal.

Where am I correct ?

Again, NOT homework question.

Now I have been labeled an "IDIOT" and having a "TANTRUM". Neither is appreciated, as well as previously "Do My Homework" and "Lazy Student". You have just lost a user to this site. To the ones who assisted me, I do thank you.

I think you calculated the number of seconds in five hours.

So where am I going wrong?

12 feet deep
288 feet wide
4.5 miles/hr = 23760 feet in 3600 seconds
= 6.6 feet per second
5 mins = 300 seconds
6.6 x 300 feet in 5 minutes
= 1980 feet
volume of water = 12 x 288 x 1980 cubic feet
= 6842880 cubic feet
1 cubic foot = 120/16 US gallons
= 7.5 US gallons
6842880 x 7.5 = 51,321,600 gallons

Don't let them get to you, ignore them. I think it's awesome that you are teaching yourself. It seems that so few people seek knowledge. Maybe put a header in your question that states you are a self learner...

Ok, I will give another chance. But fair warning: if occurs again, that's it.

Thanks for your comments. I will use the self learner header.

I rechecked the problem and have a typo:

The problem states 100 gal. = 16 cu. ft. I typed 120 gal.

16 x 7.48 = 119.68 = 120

Why would they use 100 ? A nice round number ?

I should have caught this.

US gallons are smaller than Imperial (British) gallons.

(Of course in Britain we have been using litres for the last 40 years but no matter - perhaps this is an old textbook?)

100 Imperial (British) gallons = 16.0544 cubic feet.

Thus my calculation method above was correct.

12 feet deep
288 feet wide
4.5 miles/hr = 23760 feet in 3600 seconds
= 6.6 feet per second
5 mins = 300 seconds
6.6 x 300 feet in 5 minutes
= 1980 feet
volume of water = 12 x 288 x 1980 cubic feet
= 6842880 cubic feet
1 cubic foot = 100/16 Imperial gallons
= 6.25 Imperial gallons
6842880 x 6.25 =42768000 Imperial gallons

Thanks.