Final answer:
The total miles driven on Sarah and Eva's road trip was 320 miles, calculated by setting up a proportion where 2/5 of the total distance equals 128 miles.
Step-by-step explanation:
To find the total miles Sarah and Eva drove on their road trip, considering that Sarah drove 2/5 of the total distance, and she drove 128 miles, we need to set up a proportion. Since 2/5 of the total distance equals 128 miles, we can represent the total distance as 'x' and write the following equation:
(2/5) × x = 128
We can then solve for 'x' to find the total distance:
Therefore, the total miles they drove on the road trip is 320 miles.