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Water is being filled at the rate of 1 cm 3 /sec in a right circular conical vessel (vertex downwards) of height 35 cm and diameter 14 cm. When the height of the water level is 10 cm, the rate (in cm 2 /sec) at which the wet conical surface area of the vessel increase, is

1. 5
2. 5 21
3. 5 26
4. 10 26

Correct answer: 5 26

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