Distance between the two at any time t, D = One way to calculate is to find the minima using = 0 =) 1/(2 sqrt(Doesn't matter)) x 2 x (200 - 40t) x -40 + (2 x 20t) x 20) = 0 =) 2 x (200 - 40t) x -40 = -40t x 20 =) 400 - 80t = 20t =) t = 4 hours. Alternatively, you can find the right answer by putting the options in the equation. Correct Answer: 4 h
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