I am having trouble applying the 4-momenta equation to this question and wondering if anyone could help.

**Question**

**In a lab frame, two particles have the same rest mass,
M, and the same speed , V, opposite directions collide
inelastically. They form a stationary particle with a higher total
rest mass of 20M/7.**

**Determin the speed V in terms of the speed of light by
equating 4-momenta before and after collision.**

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