The relativity twins, Simplicio and Salviati, are taking separate spaceships to another planet, which we have measured to be located 22.0 ly from us. The brothers depart at the same time. While Salviati's spaceship travels at 0.900c, Simplicio's spaceship can only travel at 0.700c. Knowing this, we set out to find out the age difference between the brothers at the time that Simplicio arrives on the planet ...
(a) Relative to the earth, how long does Simplicio's trip take?
(b) Relative to Simplicio, how long does his trip take?
(c) Relative to the earth, how long does Salviati's trip take?
(d) Relative to Salviati, how long does his trip take?
(e) After Salviati arrives on the planet, how long does he have to wait before Simplicio arrives?
(f) At the time that Simplicio arrives, which brother is older? By how many years?