3. At a sand and gravel plant, sand is falling off a conveyor and onto a conical pile at a rate of 10 cubic feet per minute. The diameter of the base of the cone is approximately three times the height. At what rate is the height of the pile changing when the pile is 15 siup FrE anoito9e feet high? Note : V=-ar 3 ibeno liul 1ot how lle worl2 ei 1sbbel ert to eesd erfT9uort s to llew erl lanisps pninsel al gnol 1991 Er 1abbel A. 9g Sto siST 6 is lew ertl mot ysws belluq mSTpsib s ledsl bris weia A anoitesup priwollot sri newanB of aoupindoel euluoleo sau ebbsl erll to gasd erit neriw llsw sr nwob privom 19bbelt ertf to gol erli ai test woH .8 Slsw ertl moji li ai bnung ert bas 1ebbel eril aauord edi to ebie ertt yd bemol elpnsint er! 1sbieno 0 2i 1ebbst ert lo aasd ert nerlw pnipnerlo ei slgnshi ertt lo s9is erlt rloirw ie eten ertt bri llsw erll moit ne 4. A spherical balloon is being filled with air in such a way that its radius is increasing at a constant rate of 2 cm/s. At what rate is the volume increasing at the instant when its surface area is 4n cm2? 4 Note: S.A.=4rr V =-ar

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