Alever with an output arm of 0.8 meter has a mechanical advantage of 6. what is the length of the input
arm?

From the law of the lever: 

mechanical advantage= input arm : output arm

input arm- a
output arm-b

Input arm is equal 4,8m

Question was not very clear if there are specific answer choices tell me and i'll try to you more. hope this though2 laps is 1 min. we know that for each min she does two times the amount of laps. for 12 laps we can do 12/2 which does give us 12 laps in 6 mins not 16 mins.

The third hammer 8 pounds