7. a 60-foot boxcar needs to get around a corner as shown in the figure to the right. the car is placed on trollies that travel along tracks perpendicular to each other. if one
end of the car is moved at 6 inches per second along the bottom wall, how fast is the other end of the car moving along the side wall when the car is 36 feet from the corner? how fast is the angle of the car against the bottom wall changing at the same time? this is a related rates problem.