A truck driver picked up a hitch-hiker as he traveled northwards out of the city. After some time, the hitch-hiker remarked that every 10 minutes they passed a truck going in the opposite direction. "How many trucks will arrive in the city in an hour" he asked, "assuming that the trucks are traveling at equal speeds in both directions?" The driver replied "Six, it is obvious because 60 diveded by 10 is 6." Was he Correct?