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Related Rates - Flowers at a Florist

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Flowers at a florist are stored in vases which are in the shape of hollow inverted right circular cone with height 72 cm and radius 18 cm. One such vase is initially empty and placed, with its axis vertical, under a tap where the water is flowing into the vase at the constant rate of 6???? ????????3/????. Determine the rate at which the height is rising 12.5 minutes after the vase was placed under the tap.
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Флористика
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