Gravel is being unloaded from a truck and falls into a pile shaped like a cone at a rate of 16 cubic feet per minute. the radius of the cone base is 4 times the height of the cone. find the rate at which the height of the gravel changes when the pile has a height of 7 feet.

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.