Collars A and B are connected to the cord that passes over the small pulley at C. When A is located at D, B is 12 ft to the left of D. If A moves at a constant speed of 4 ft/s to the right, determine the speed of B when A is 4 ft to the right of D.

1) 2.77 ft/s
2) 3.56 ft/s
3) 4.33 ft/s
4) 5.55 ft/s

If the total length of the cord used be L then

So the speed of B s_B = 2.77 ft/s