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**Spaceships--special relativity**

**1. Homework Statement**

Spaceship #1 moves with a velocity of .2c in the positive x direction of reference frame S. Spaceship #2, moving in the same direction with a speed of .6c is 3 x 10^9 m behind. At what times in reference frames S, and in the reference frame of ship #1, will 2 catch up with 1.

**2. Homework Equations**

**3. The Attempt at a Solution**

I solved for the relative velocity of ship 2 in the IRF of ship 1. I got .7143c. I'm not really sure where to proceed from here. Any ideas?