The outer diameter of a long concrete pipe is 68 cm and its wall thickness is 4 cm. If the water flows at a rate of 9 litres per minute, how long (in m) would the water have flowed in an hour?

\frac{3}{π}

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6 π

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\frac{6}{π}

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9 π

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Solution

The correct option is C $\frac{6}{π}$

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The outer diameter of a long concrete pipe is 68 cm and its wall thickness is 4 cm. If the water flows at a rate of 9 litres per minute, how long (in m) would the water have flowed in an hour?

The correct option is C 6π

The correct option is C $\frac{6}{π}$