How fast was the parent?

Two particles of masses mm and 4m4m have velocities of 4v4v and v,v, respectively. They are moving at an angle of 3030^\circ with respect to each other.

If the particles have come from a decay of a single parent particle, and both mass and momentum are conserved, how fast was the parent particle moving?

Note: For the purposes of this problem, ignore energy conservation requirements and relativistic effects.

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