Gregory drives 15 miles per hour slower than Ryan. They started at the same spot, and drove in opposite directions. After7.1 hours, they were 646.1 miles apart. Find each car's speed.
r speed = x
g speed = x-15
there speed of separation is the sum of these x + x -15
after 7.1 hrs (rate x time = distance)
7.1 ( x + x-15) = 646.1 solve for 'x' ryan speed then greg speed = x - 15