How much work is done when an object is moved 2.1 m by a force of 1.8 N

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges