Two Spaceships Travelling in Opposite Directions Along Parallel Lines Measure

Multiple Choice

Two spaceships travelling in opposite directions along parallel lines measure their own and the other spaceship's length while passing one another. The crew on spaceship A says that their ship is 1000-m long and that ship B is 800-m long. The crew on ship B says that their ship is 1000-m long and that ship A is 800-m long. At what speed does each crew say that the other ship is travelling relative to their own ship?

A) 0.36 c
B) 0.60 c
C) 0.64 c
D) 0.80 c
E) 1.25 c