How can i do this step by step? convert 13 feet per second to miles per hour.

You would multiply 13 by 60 to get minutes then by 60 again to get feet per hour so 13*60*60= 46,800 feet per minute then divide by 5,280, which is feet per mile so 46,800/5,280 = 8.863 MPH

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.