A flatbed truck travels 144 miles in 5 hours . A semi-trailer truck travels 327 miles in 4 hours . A tanker truck travels 589 miles in 15 hours . Which truck has the fastest average speed ? plz help !!

15. jiovanni is looking in to two different companies that offer study guides for math exams.test prep 101 charges a $5 flat fee and an additional $0.25 per problem.math charges a $2 flat fee and an additional $0.50 per problem.how many prablems would make the costs of the two companies be equal? varibles: equations/eniqualities{ {