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Two particles 1 and 2 move with constant...

Two particles 1 and 2 move with constant velocities `barV_(1) and barV_2.` At the initial moment (t = 0 sec). Their position vectors are equal to `bar(r_1) and bar(r_2)`. How must these four vectors be interrelated for the particles to collide.

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`(barr_1 -barr_2 )/(| barr_1 - barr_2|)=( vecV_2 - vecV_1)/(|vecV_2 - vecV_1|)`
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