1) (Related Rates) One end of a rope 20 meters long is attached to a box resting on the floor. The other end is passed over a pulley directly above the box, 5 meters above the floor, and attached to the back of a truck at a point 1 meters above the ground. The truck then drives in a straight line away from the pulley at a speed of 0.5 m/s. At what speed is the box rising when the top of the box is 2 meters above the ground? I really don't get this problem. I can't even start doing the calcultions because I am not sure how to set up the variables in the problem...can someone please give me some guidelines/hints? Thanks a lot!