On the number line, a bug p is moving in the positive direction from the point 0, and a bug n is moving in the negative direction from the point 0. the speeds of both bugs are constant. both leave 0 at the same time, and four seconds later p has reached 12 and n has reached –8.if x is the point reached by p after t seconds, and y is the point reached by n after t seconds, express x and y in terms of t.30 seconds after leaving point 0, how far apart are  p  and  n? when will  p and  n  be 300 units apart?