On a 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.
a)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.
b)30 seconds after leaving point 0, how far apart are P and N?

Question

On a 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.
a)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.
b)30 seconds after leaving point 0, how far apart are P and N?