1. During 60mi of city driving, Jenna averaged 15mi/gal. She then drove 140mi on an expressway and averaged 25mi/gal for the entire 200mi. Find the average fuel consumption on the expressway.

How many gallons did she use on her first trip ?

How many gallons did she use for the whole trip ?

So how many gallons did she use on the expressway ?

Can you take it from there ?

To find the average fuel consumption on the expressway, we need to determine the total fuel used during the expressway driving and divide it by the distance covered.

First, let's calculate the fuel used during city driving. Jenna drove 60 miles in the city at an average rate of 15 miles per gallon, so she used 60 miles / 15 miles per gallon = 4 gallons of fuel.

Next, let's calculate the fuel used during the total 200 miles. Jenna drove 200 miles in total, and we already know she used 4 gallons of fuel during the city driving. Therefore, she used a total of 200 miles - 60 miles = 140 miles during the expressway driving.

Given that she averaged 25 miles per gallon during the entire 200 miles, we can calculate the fuel used during the expressway driving as 140 miles / 25 miles per gallon = 5.6 gallons.

Finally, to find the average fuel consumption on the expressway, we divide the fuel used during the expressway driving (5.6 gallons) by the distance covered during the expressway driving (140 miles).

Therefore, the average fuel consumption on the expressway is 5.6 gallons / 140 miles = 0.04 gallons per mile.