Answer:
Let us first determine the time at which Ruby and Harry meet. Let t be the time (in hours) that Ruby drives before they meet. Then, Harry drives for t - 0.5 hours before they meet. We know that the total distance they cover is 100 km, so we can write an equation in terms of t:
30t + 60(t - 0.5) = 100
Simplifying and solving for t, we get t = 1.5 hours.
Now, we can determine the distance each person has driven when they meet. Ruby has driven 30 * 1.5 = 45 km, while Harry has driven 60 * 1 = 60 km. Since the distance between the two cities is 100 km, we can see that Harry is closer to city A when they meet, since he has driven 60 km compared to Ruby's 45 km.