Icant figure out how to do this and i have a test tommorow me and explain

Marcus built a model car that is 4 inches wide. what scale was used to build the car if the actual width of the car is 6 feet? a. 1 in. = 2 ftb. 1 in. = 2.5 ftc. 1 in. = 1.5 ftd. 1 ft = 1.5 in.

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

Need solving this second acceleration problem.