Nothing.
11 x 6 has no measurement units associated with them and so it is impossible to express 11 x 6 in metres.
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It is: 11*5*6 = 330 cubic meters
111m
6 x 4 = 24 square meters
66
Not even close. The hole has a volume of 6 x 10 x 0.5 = 30 cubic meters.