Two lines, 1 dotted and 1 solid, are plotted on a coordinate plane. The dotted line is labeled upper T left parenthesis m right parenthesis. The solid line is labeled upper S left parenthesis m right parenthesis.

To determine how long Tatiana will have to wait for Shayna to arrive, you will need to find the point where the two lines intersect on the graph. The intersection point represents the time when both students arrive at the store.

Once you identify the x-coordinate of the intersection point (which represents time in minutes), that will be the answer to how long Tatiana has to wait for Shayna.

For example, if the intersection point is at (10, y), then Tatiana will have to wait for 10 minutes if she is already at the store.

If you can't see the graph, I can't give you the specific wait time. Please provide the x-coordinate of the intersection point or values from the graph to assist you further!