Question 833915
{{{Rate*Time=Distance}}}


Nick and Jessica going in opposite directions means that the rate at which they are separating is the sum of their traveling rates.  They are INCREASING the distance between them.


In one direction, Nick goes {{{3(mile/hour)*t(hours)}}};
In the opposite direction, Jessica goes {{{6(miles/hour)*t(hours)}}}, for the same time, {{{t}}}.


You are interested in the situation where and when they are 3 miles apart:
{{{highlight(3t+6t=3)}}}, and be aware, time t is in HOURS, so you'll want maybe, to convert to minutes after solving for t.