Question about FTL Travel

Imagine a line (L) with three points (P1,P2,P3):



Earth is represented by P2, P1 and P3 represent crafts moving away from Earth at .75 the speed of light.

To an astronaut on craft P1, is P3 moving faster than light?

What if a third craft traveled at a 45 degree angle to L, stopped, turned around, and viewed P1 and P3?

It seems to me that from the perspective of the third craft, P1 and P3 are increasing the distance between themselves at a speed greater than the speed of light.

Knowing little to nothing about Physics, I don't know why my perspective is inaccurate, but I believe it must be. I'm confident that someone here can straighten me out!