A hollow with it axis vertical and vtex Sand is cone with verticle asple 60°, held down wards. being un pared int the is cubi metres per cone at ifarm mite of ) show that when the sand evel has secand. a :) reached volme heigut h metes the a The sand in The cone, is V = Find the rate at which the snd lexel i nising when t depth is 4metes

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