A meter-long pipe is made whose internal diameter is

Solution

Let the radius of the inner cylinder be r and the radius of the outer cylinder be R. 2r = R  In this figure, the amount of water that will flow will be equal to the volume of the inner cylinder. The volume of cylinder = πr²h 88/7 =  22/7 ×1× r² r  = 2 , then R = 4 Materials used to make pipe (volume) = volume of outer cylinder - volume of the inner cylinder = πR²h-πr²h V = πh (R²  -r²  ) V = 22/7 ×1×(16-4) V =  22/7 ×1×12 V = 37.7 m³