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The given figure shows the cross section of a water channel consisting of a rectangle and a semicircle.

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The given figure shows the cross section of a water channel consisting of a rectangle and a semicircle. Assuming that the channel is always full, find the volume of water discharged through it in one minute if water is flowing at the rate of 20 cm per second. Give your answer in cubic metres correct to one place of decimal.

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Length = 21 cm, Breadth = 7 cm

Radius of semicircle = 21/2 cm

Area of cross section of the water channel

Flow of water in one minute at the rate of 20 cm per second

Length of the water column = 20 × 60 = 1200 cm

Therefore, volume of water 

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