Water has been poured into an empty rectangular tank at the : GMAT Quantitative Section
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# Water has been poured into an empty rectangular tank at the

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Intern
Joined: 12 Jan 2008
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Water has been poured into an empty rectangular tank at the [#permalink]

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16 Jan 2008, 19:28
Water has been poured into an empty rectangular tank at the rate of 5 cubic feet per min for 6 minutes.
The length of the tank is 4 feet and the width is one half of the length. How deep is the water in the tank?

A) 7.5 inches
B) 3 ft. 7.5 inches
C) 3 ft 9 inches
D) 7 ft 6 inches
E) 30 ft

Could someone explain this problem to me plz?
CEO
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16 Jan 2008, 22:24
Gaanu84 wrote:
Water has been poured into an empty rectangular tank at the rate of 5 cubic feet per min for 6 minutes.
The length of the tank is 4 feet and the width is one half of the length. How deep is the water in the tank?

A) 7.5 inches
B) 3 ft. 7.5 inches
C) 3 ft 9 inches
D) 7 ft 6 inches
E) 30 ft

Could someone explain this problem to me plz?

Well to be honest, I'm not sure if this question is complete or not. when the water is poured into the empty tank what capacity is it filled to??? half, full, quarter???

Owell well just say full.

6min*5cubic feet = 30cubic feet

4*2*h=8h --> 8h=30 h=15/4 --> 3 ft 3/4 or 3ft 9 inches. NOT 3 ft 7.5 inches b/c 3/4 of a foot is 9 inches.

C
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17 Jan 2008, 01:38
5 cubic feet for 6 mins therefore 30 cubic feet is in the tank.

length = 4ft
width = 4/2 = 2 feet

therefore base area = 8 sq.ft

therefore 8*depth = 30

therefore 30/8 = 3.75 feet = 3ft 9 inches
C)
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17 Jan 2008, 01:59
5 cubic feet for 6 mins therefore 30 cubic feet is in the tank.

length = 4ft
width = 4/2 = 2 feet

therefore base area = 8 sq.ft

therefore 8*depth = 30

therefore 30/8 = 3.75 feet = 3ft 9 inches
C)

I am from country where other measurement system is used and I do not know how many inches in feet at all, to be honest I even do not know what can be measured in feet and inches (length, volume, weight???) so how can I solve that type of problem? I have solved it till the moment when d=3.75? so how can I know that 3/4 part of feet is 9?
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17 Jan 2008, 04:14
i think you have to know the basic conversion like 1 ft has 12 inches.

but i don't think they will ever ask you to convert from one system to another ( miles to km for example)

BTW where I am from we are all metric too.
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22 Jan 2008, 20:09
thank you guys, ya i wasnt sure on how to do the problem but C is correct...thank you
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22 Jan 2008, 20:10
correction, now i kno how to do the prob.....srry for typo..thanks again
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24 Nov 2011, 09:08
Out of curiosity, one small doubt,

Does one half means 1/2 or 1 and 1/2 which is 3/2.....
Re: Water   [#permalink] 24 Nov 2011, 09:08
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