It depends on whether the 17 * 7 * 7 are in feet or yards or miles, inches, cubits or metres or whatever. None is specified so no answer can be given.
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40 feet x 7 feet x 7 feet = 1960 cubic feet.
There are: 20*4*7 = 560 cubic feet
5.55
1 cubic yard = 3*3*3 = 27 cubic feet 27 cubic feet spread to a thickness of 7/12 feet gives = 27/ (7/12) = 27*12/7 = 46.2857 sq feet (to 4 dp)
87.5 cubic feet