Let's start with the length. All you need to do is multiply is by 1/500. You could also find the decimal equivalent to 1/500. 1/500= .002 200×.002= .4 So length of the model is .4 ft. The width: .002×140=.28 The width of the model is .28 ft. The length of the model is .4 ft and the width of the model is .28 ft.