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# The area of the base of a tank is 100 sq. ft. It takes 20 seconds to

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Math Expert
Joined: 02 Sep 2009
Posts: 59725
The area of the base of a tank is 100 sq. ft. It takes 20 seconds to  [#permalink]

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02 Apr 2019, 23:49
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Difficulty:

15% (low)

Question Stats:

88% (01:04) correct 12% (01:27) wrong based on 26 sessions

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The area of the base of a tank is 100 sq. ft. It takes 20 seconds to fill the tank with water poured at rate of 25 cubic feet per second. What is the height in feet of the rectangular tank?

(A) 0.25

(B) 0.5

(C) 1

(D) 5

(E) 25

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Re: The area of the base of a tank is 100 sq. ft. It takes 20 seconds to  [#permalink]

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03 Apr 2019, 11:22
Area of the tank = LBH
LB = 100
H = ?

Time taken = Area/Speed = 100*H/25 = 20
H = 5

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Re: The area of the base of a tank is 100 sq. ft. It takes 20 seconds to  [#permalink]

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07 Apr 2019, 18:19
1
Bunuel wrote:
The area of the base of a tank is 100 sq. ft. It takes 20 seconds to fill the tank with water poured at rate of 25 cubic feet per second. What is the height in feet of the rectangular tank?

(A) 0.25

(B) 0.5

(C) 1

(D) 5

(E) 25

The volume of the tank is 20 x 25 = 500 cubic feet. Since volume = base area x height, we can let h = height of the tank, so we have:

500 = 100 x h

5 = h

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Re: The area of the base of a tank is 100 sq. ft. It takes 20 seconds to   [#permalink] 07 Apr 2019, 18:19
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