Let the speed of the first train be v mph. Then the speed of the second train is: (v + 50) mph. Distance traveled by the first train from 3pm to 7pm = 4v miles. The second train travels 4v miles in 2 hours (from 5pm to 7pm). Therefore the speed of the second train = (4v)/2 = 2v. However the speed of the second train is also given by (v + 50) mph. v + 50 = 2v v = 50. The speed of the first train is 50 mph and the speed of the second train is 100 mph.
Using the reflection rule, you can find coordinates of image points: L'(1,3), M'(3,4), N'(3,5) and P'(1,4). As you can see, these are coordinates of vertices of the figure C
