Carrie and Brendan are walking to their classes at Centerville College. Carrie comes from her dorm room, walking at a speed of 4 miles per hour down a straight path. Brendan comes from the gymnasium on the other end of campus, moving up the same path at 3

Carrie and Brendan are walking to their classes at Centerville College. Carrie comes from her dorm room, walking at a speed of 4 miles per hour down a straight path. Brendan comes from the gymnasium on the other end of campus, moving up the same path at 3 miles per hour. If they start out 2 miles apart, how long will it be before they meet?