2. 外语
  3. 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

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

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问题 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?
选项 A、5
B、15
C、30
D、45
E、90
答案D
解析 The correct answer is D. 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 12×, or 4 hours.
Therefore, Jim traveled 180/4, or 45 miles per hour.
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