Answer
69,480 lb
Work Step by Step
$V = l \times w \times h$
$V=15 ft \times 12 ft \times 2 ft = 360 ft^{3}$
Since the weight given is for one cubic foot, multiply by the volume to find the total weight.
$360 ft^3 \times 193\frac{lb}{ft^3} = 69480 lb$