<PRE><B>Question 353794</B>
Two roads diverge from a point at an angle 120. two persons starting from the point walk along roads at 3km and 2km per hour. Find the distance between them?
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Use the Cosine Law:
{{{c^2 = a^2 + b^2 - 2abcos(C)}}}
{{{c^2 = 4 + 9 - 2*3*cos(120)}}}
{{{c^2 = 13 + 3}}}
c = 4 km/hr
c increases at 4 km/hr
c = 4t km, t in hours
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