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Two particles move directions (t 10,0 - t, 12) and (1,4,2 - t). through space in such a way that at time t they are travellin

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Answer #1

welcome

if their directions are parallel, then

[t -10] / 1 = [0-t] / 4 = [12 ] / [2-t]

or t - 10 = - t / 4

or 4t - 40 = -t

or 5t = 40

or t = 8

thus at t = 8 their directions are parallel

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