Justify your answer. [7 marks] 6. A fuel truck, has a cylindrical tank of radius R = 2 m and leng . L = 10 m lying horizontally. The volume of gasoline in the tank is given by V = L R2 cos-1 R - h R - (R - h)V2Rh - h2 where h is the vertical height of the gasoline in the tank. If gasoline is being pumped into the tank at a rate of 2 m3 /min, how fast is the gasoline level rising when the height h of the gasoline is 1 m