Spaceship A is moving at 1500km/s and Spaceship B moving at…

Spaceship A is moving at 1500km/s and Spaceship B moving at 3000km/s, both moving to the left. Spaceship A and B are constant communication.   a) if you are in spaceship A will you observe doppler effect in the signals from spaceship B? Redshift, blueshift or both? Explain your answer in as much details as possible.  b) if you are in spaceship B will you observe doppler effect in the signals from spaceship A?  Redshift, blueshift or both? Explain your answer in as much details as possible.