Two galaxies on opposite ends of the universe are moving away from the Earth. Each has a velocity of 200,000 km/s relative to the Earth. How fast would an observer in one of those galaxies see the other galaxy moving away?

between 300,000 and 400,000 km/s

200,000 km/s

400,000 km/s

between 200,000 and 300,000 km/s

2 answers

C
since the speeds are low relative to the speed of light.
It was D.