In a geometry problem with no picture, you should just draw a picture to help visualize. But beware! The reason that they didn't provide a picture is that there is an easy assumption to be made when drawing it yourself. In this problem, drawing a picture of two parallel lines with two points on each seems simple enough. But the assumption that most will make is that because lines l and m are parallel, points P and Q, and points R and S are next to each other. If they are, then T will be equidistant from R and S and the answer would be C.
But if you realize that points R and S can slide anywhere they want on line m as long as they stay the same distance apart, you'll see that the distance from T to either R or S can be basically anything. Thus the real answer is D.
_________________





Need help with GRE math? Check out our groundbreaking books and app.