Question: As observed from Earth, rocket Alpha moves with speed 0.90c and rocket Bravo travels with a speed of 0.60c. They are moving along the same

As observed from Earth, rocket Alpha moves with speed 0.90c and rocket Bravo travels with a speed of 0.60c. They are moving along the same line toward a head-on collision. What the speed of rocket Alpha is as measured from rocket Bravo?

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