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## Homework Statement

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?

## Homework Equations

U = (U' + V) / 1+ VU'/c^2

## 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

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