You need 3 figures to get cubic feet.
9.27 cubic feet
162 cubic feet.
Volume = 40*8*8.5 cubic feet = 2720 cubic feet
87.5 cubic feet
3 x 2 x 2 = 12 cubic feet
An 8-inch pipe that is 16,800 feet long has a volume of: 5,860 cubic feet (43,835.8 liquid gallons).
420
400.
8.333 cubic feet
3,000 cubic feet
4200 cubic feet
147 cubic feet of cement are required.