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Two particles 1 and 2 move with constant...

Two particles 1 and 2 move with constant velocities `vecV"and "vecV_(2)`. At the initial moment `(t=0sec)`. Their position vectors are equal to `vecr_(1)"and"vecr_(2)` . How must these four vectors be interrelated for the paticles to collide.

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The correct Answer is:
`(vecr_(1)-vecr_(2))/(|vecr_(1)-vecr_(2)|)=(vecV_(2)-vecV_(1))/(|vecV_(2)-vecV_(1)|)`
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