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9 A trough of length 6'm has a uniform cross-section which is a 2 m trapezium with side lengths shown. Water leaks from the bottom

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9 A trough of length 6'm has a uniform cross-section which is a 2 m trapezium with side lengths shown. Water leaks from the bottom of the trough at a constant rate of 0.1 m per minute. Find the rate at which the water level is falling at the instant when the water is 20 cm deep. 1 m

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