Two trucks started toward each other at the same time from towns 500 km apart. one truck traveled at a rate of 65 km per hour while the other traveled at 60 km per hour. after how many hours did they meet? if x represents the number of hours, which of the following equations could be used to solve the problem? 65x = 60x 65x - 60x = 500 65x + 60x = 500