# SOLUTION: A pipe of 2 inch diameter fills the water tank in one hour. If the diameter of the pipe is 4 inch in what time will the pipe fill the same tank?

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 Question 633947: A pipe of 2 inch diameter fills the water tank in one hour. If the diameter of the pipe is 4 inch in what time will the pipe fill the same tank?Answer by solver91311(16868)   (Show Source): You can put this solution on YOUR website! The volume of water that flows through a pipe is proportional to the cross-sectional area (the area of a circle with diameter equal to the inside diameter of the pipe). Since the area of a circle is given by , the flow is proportional to the square of the radius. So how much larger is than ? John My calculator said it, I believe it, that settles it