Question 98217
Welcome to the world of dimensional analysis! At the end of this problem you are looking for cm/mi. To start we know that they are 5280 ft/1 mi. Next, you need to cancel the feet measurement with the following conversion factor 
12 in/ 1 ft. Finally cancel the inch measurement with the following conversion factor 2.54 cm/ 1 in. In the end you will have cm in the numerator and miles in the denominator which will be your answer.