Heide boards a spaceship and travels away from Earth at a constant velocity of 0

Question

Heide boards a spaceship and travels away from Earth at a constant velocity of 0.40c toward Betelgeuse. One year later on Earth clocks, heide's twin, Hans, boards a second spaceship and follows her at a constant velocity of 0.90c in the same direction.
a) When Hans catches up to Heide, what will be the difference in their ages?
b) which twin will be older?

in part a, i figured upto the part before Hans spaceship boards at a constant velocity of 0.90c....and then i'm lost how to choose a frame which is at the rest between heide's and Han's...Please help me

Explanation / Answer

?t=??t0 ?= 1 / v(1-v2/c2)

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