Call the distance that Han travels "h" and the distance Jada travels "j. They both travel for the same
amount of time, call it "t". Since Han goes 11 miles per hour, h/t must equal 11. Since Jada goes 14 miles
per hour, j/t must equal 14. So we can rearrange to solve for t:
= 11 becomes t = h/11
= 14 becomes t = j/14

Now we know that h/11 and j/14 must equal each other, since they both equal "t". But we still have two unknowns. So we need to use the information that they live 7 miles apart. That means that the distances they travel have to add up to 7 miles. So h+j=7.