SSSSSS Last year, Mr. Harper completed a 50-mile bike race in 4 hours 20 minutes. This year he would like to complete the same race in 4 hours. How many miles per hour should Mr. Harper cover in order to complete the bike race in 4 hours? [D-r] S A 14.5 miles per hour B 13.5 miles per hour C 12.5 miles per hour D 11.5 miles per hour