Given that length of the building = 200 feet
Given that width of the building = 140 feet
Now it says that "a 1/500 model is built of the building "
Which means they want to create a model with ratio 1 feet for each 500 feet.
So to find the length and width of the model we will simply divide given sides by 500.
Side length of the Model = 200/500 = 2/5 = 0.4 feet
Side width of the Model = 140/500 = 14/50 = 0.28 feet
Hence final answer is model will be of length 0.4 feet and width 0.28 feet.