Two brothers leave from the same point driving in opposite directions, the first brother driving at 60 miles per hour and the s
econd at 65 mph. The first brother has a one-hour head start. If each brother has a communication device that allows him to talk to the other for up to a 200-mile range, how long will they be able to talk to each other? The communication devices will be out of range __ hours after the first brother left.
