Ben swims 50,000 yards per week in his practices. Given this amount of training, he will swim the 100-yard butterfly in 41.6 seconds and place th in a big upcoming meet. Ben's coach calculates that if Ben increases his practice to 60,000 yards per week, his time will decrease to seconds and he will place th in the meet. If Ben practices 70,000 yards per week, his time will be seconds and he will win the meet. Part 2 In terms of Ben's time in the big meet, what is his marginal productivity of the number of yards he practices? Part 3 The marginal product of increasing practice yards from 50,000 to 60,000 is enter your response here second(s) (enter a numeric response using a real number rounded to one decimal place)