I have to lift a 3300 lbs cate 25 feet using a horse and a compound pulley with a mechanical advantage of 4. I know W=FD and 1 horse power is 550 ft lbs per sec. I also know the the pulley will make the lift lighter but the horse will have to pull further. I need to find how long it takes for the horse to lift the load. If I haven't made myself clear enough, leave a comment as I will check back frequently this weekend. Thank you!