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The ratio of the rate of flow, of water in pipes varies inversely as the square of the radius of the pipes. What is the ratio of the rates of flow in two pipes of diameters 2 cm and 4 cm? `1:2` b. `2:1` c. `4:1` d. `1:8`

A

`1 : 2`

B

` 2 : 1`

C

` 1 : 8`

D

`4 : 1 `

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D
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