单选题 If Tom traveled 45 miles in 12 hours and Jim traveled four times as far in one-third the time, what was Jim's average speed, in miles per hour?

(A) 5
(B) 15
(C) 30
(D) 45
(E) 90

【正确答案】 D

【答案解析】You are given that Tom traveled 45 miles in 12 hours and that Jim traveled four times as far in one-third the time. That means that Jim traveled 45×4, or 180 miles in [*] or 4 hours. Therefore, Jim traveled [*] , or 45 miles per hour.