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Positron and an electron collide producing 2-gamma rays

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If a positron and an electron are both travelling at 0.450c in opposite directions as measured in a laboratory. They collide (and anihillate) producing 2-gamma rays, what is the energy of each of these rays? Express in MeV. (electron mc^2 = 0.511 MeV)

Also, how fast is the positron travelling as viewed from the electrons reference frame? (HINT: one velocity needed is that of the lab relative to the electron, NOT the electron relative to the lab) [Answer: 0.74c]

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Positron and an electron collide producing 2-gamma rays are determined.

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The total energy of the electron or positron moving with a velocity of 0.45 c, is
M eV
Since ...

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