The answer will be 53/135, or in decimal form, 0.39259259...
5x + 5 + 6 = 21
5x + 11 = 21
5x = 10
X = 2
Let x be the distance from Syracuse where they pass. The first car travels a distance of x in time x/65 while the second car travels a distance 240-x in time (240-x)/55. They pass at the same time after leaving their starting points so x/65=(240-x)/55.
Cross-multiplying we get: 55x=65(240-x)=15600-65x, 120x=15600, x=15600/120=130 miles.
They pass 130 miles from Syracuse.
17-9 = 8
8 is your answer.