Problem 47053. Deduce Equations for Simplified Interstellar Doppler Effect ✨

The problem statement is useless. They weren't in constant contact, and the answers line up with when C-3PO sent goodbye, not R2-D2. Perhaps this will work:

R2-D2 and C-3PO are friends on Alderaan. R2-D2 boards a spacecraft at speed c/x bound to a galaxy far, far away while C-3PO remains on Alderaan. On reaching the marker 1 light year out from Alderaan, R2-D2 sends a message back to C-3PO. C-3PO and R2-D2 reply each reply as a message is received, until n messages are sent. When C-3PO sent their last message, how far away, in light years, was R2-D2 by 3PO's reckoning?