1. The problem statement, all variables and given/known data relative to A, B is moving towards A at a speed of 0.4c. Farther out C is moving towards A at a speed of 0.5c. all motion is along the x axis how fast is C moving relative to B? 2. Relevant equations U = (U' + V) / 1+ VU'/c^2 3. The attempt at a solution 0.4c- 0.5c / 1 - (0.4c * 0.5c) / c^2 = 0.125 C is moving at c/8 towards B ?