Question: i need help in solving this question 4. A conical paper cup is 20 cm tall with a radius of 10 cm. The cup is

i need help in solving this question

4. A conical paper cup is 20 cm tall with a radius of 10 cm. The cup is being filled with water at a rate of 4 4 cm3/sec. How fast is the water level rising when the water level is 9 cm? 11 (A) cm 11 (C) cm sec (B) cm sec (D) 9 cm (E) 1cm/ sec sec sec

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