Find the rate at which the water is leaking out

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a reservoir 80 meter long and its cross section is an isosceles trapezoid having equal sides of 10 meter, and an upper base of 17 meter, and a lower base of 5 meter. at the instant when the water is 5 meter deep, find the rate at which the water is leaking out if the water level is falling at the rate of 0.1 meter per hour.

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