Question 849300
Uniform rates for fuel efficiency.  
R is fuel rate in miles per gallons; {{{highlight_green(R*d=v)}}}, d is distance and v is volume of fuel.


The question asks for miles each of highway and of city driving, so call these x and y.


________________MGP___________distance____________fuel volume
Highway_________33______________x_________________33x
City____________28______________y_________________28y
TOTALS_________________________317________________10


The totals indicate what the two simultaneous equations are.  Solve that system for x and y.  You might likely find substitution method the most comfortable.