Final answer:
Susan's unit rate of gas mileage is 40 miles per gallon, calculated by dividing 120 miles by 3 gallons. Jill's unit rate of work hours is 5 hours per day, found by dividing 35 hours by 7 days.
Step-by-step explanation:
The question relates to calculating the unit rate for mileage and work hours. To find Susan's unit rate of gas mileage, we divide the total distance she drove by the number of gallons of gas she used. For Jill's work hours per day, we divide the total hours she worked by the number of days.
Susan drove 120 miles on 3 gallons of gas. To calculate the unit rate of her mileage per gallon, we perform the following calculation:
- Divide the total miles by the total gallons: 120 miles ÷ 3 gallons = 40 miles per gallon.
Jill worked 35 hours over 7 days. To find out how many hours she worked per day, we do the following:
- Divide the total hours worked by the number of days: 35 hours ÷ 7 days = 5 hours per day.
Therefore, Susan's unit rate is 40 miles per gallon of gas, and Jill worked an average of 5 hours per day.