Two spaceships approach Earth from the same direction. One has a speed of 0.21c and the other a speed of 0.34c, both relative to Earth. What is the speed of one spaceship relative to the other?
A) 0.18c
B) 0.16c
C) 0.14c
D) 0.13c
E) 0.15c

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The Answer of Two spaceships approach Earth from the same direction. One has a speed of 0.21c and the other a speed of 0.34c, both relative to Earth. What is the speed of one spaceship relative to the other?
A) 0.18c
B) 0.16c
C) 0.14c
D) 0.13c
E) 0.15c

Two Spaceships Approach Earth from the Same Direction