Answer:
x = 11
Explanation:
well you take the base equation 11*x + 1*x = 286
( x being hours and y being the number of miles)
then you put in the numbers of the question it gives you 11x + 15x = 286 then you should add 11x and 15x together because they have the same variable which gives you 26x = 286 then you divide 286/26 so that you get x = 11