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Water is flowing at the rate of 15km/hour through a pipe of diameter 14cm into a cuboidal pond which

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Water is flowing at the rate of 15km/hour through a pipe of diameter 14cm into a cuboidal pond which is 50m long and 44m wide. In what time will the level of water in the pond rise by 21cm?

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Quantity of water flowing through pipe in 1 hour 

= (π  x 7/100 x 7/100 x 15000 m3)

Required time = (50 x 44 x 21/100) ÷ (π x 7/100 x 7/100 x 15000)

= 2 hours

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