Chapter 26, Problem 27P

To determine

The speed of radio waves that your antenna registers compared to the speed of those waves that your friend’s antenna is registering, if you and your friend listen to music on the same radio station which is $100\text{ miles}$ to the west of you, while imagining that you are living in a universe where the speed of light is $50\text{ m/s}$, and you are sitting on a train moving west at a speed of $20\text{ m/s}$ relative to the track while your friend moves on a train in the opposite direction at a speed of $15\text{ m/s}$.