Astronauts at the ISS orbit around the Earth at about 8km/s. Thus, from the Earths perspective,…

Astronauts at the ISS orbit around the Earth at about 8km/s.
Thus, from the Earths perspective, the ISS experiences some amount
of time dilation.
A. If an astronaut spends 60 years of their life on the ISS, how
much time will have passed on Earth?
B. Two identical twins, Twin A and Twin B, are astronauts in
training. Twin A is selected to go on the ISS for two years while
Twin B remains on Earth. Eventually, Twin A returns to Earth. Are
the siblings still the same age or has one aged more than the
other?