I really could use the help with these math word problems. I need explanation with it too please and thank you.

8. Joe can chop vegetables in 5 minutes, and Rich can chop the same amount of vegetables in 4 minutes. Working
together, how long will it take them to chop that batch of vegetables?

9. At Ricardo's Tacos, four tacos and two orders of chips cost the same as two tacos and four orders of chips. If
Ricardo's charges $2.00 for a single order of chips, how much does Ricardo's charge for 1 taco?

10. Broccoli is $1.69 per pound. Meg paid $8.45 for broccoli. How many pounds did she purchase?