The illustration below shows a combination of a double and triple block pulley system. The pulleys each turn freely on a pin as axis, and are drawn with different diameters, to show the parts of the rope more clearly. There are 5 parts of rope.
Note: For rope (n1, n2, etc.), the velocity which the weight W will be raised equals of the velocity of the force applied at F.
F = W/n
W = nF
Where:
W = Unknown weight
F = Applied force
n = number of ropes or cables
