Suppose intelligent life is discovered on a planet orbiting a star 5 light years away from the sun. After many years of communication and planning, an exchange program is arranged thusly:
Interstellar spaceships will be launched simultaneously from each planet toward the other. Both spaceships will travel at v/c=0.6 towards the other planet. To avoid an accidental head on collision, each spaceship will flash an omni directional light beacon at a rate of 10^-6 years(about once every 30 seconds) as measured in the spaceship's IRF. The beacon will be turned on immediately after launch.

In the IRF of the spaceships, how long does the trip take?

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