The volume of a rectangular solid is computed as follows:
V = l*w*h
Substituting with l = 7, w = 2, and h = 8, we get:
V = 7*2*8
V = 112
Substituting with l = 3, w = 11, and h = 7, we get:
V = 3*11*7
V = 231
Substituting with l = 6, w = 9, and V = 540, we get:
540 = 6*9*h
540 = 54*h
540/54 = h
10 = h