20) A pipe is at least 21 feet long, and must be cut into three pieces. The 2nd piece must be twice as long as the first piece, and the 3rd piece must be one foot longer than the second piece. Using an inequality, find the minimum length of the first piece.

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.

Hello!
volume of sphere =4/3.pi.r^3