D=rt solve by setting up a system of linear equations with 2 variables and 2 unknowns. a jeep and a bmw enter a highway that runs east-west at the same exit heading in opposite directions. the jeep entered the highway 30 minutes before the bmw entered the highway, and traveled 7 mph slower than the bmw. after 2 hours from the time the bmw entered the highway, the cars were 306.5 miles apart. find the speed of each car, if they were driven on cruise control