#1. 24" is in inches while the ground measurement is in feet. convert: 24" = 2' 1800' × 1500' × 2' = 3,600,000 ft³
#2. The height and width of the truck-bed is 7.5 feet. The length is 15 feet. Divide the truck-bed height/width by the side length of the cube shaped box, 2.5 feet.