2. 外语
  3. On a trip of 408 miles, Tom travels the first 160 miles in 4 hours. At what rate must he travel for the remainder of the trip in

On a trip of 408 miles, Tom travels the first 160 miles in 4 hours. At what rate must he travel for the remainder of the trip in

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问题 On a trip of 408 miles, Tom travels the first 160 miles in 4 hours. At what rate must he travel for the remainder of the trip in order to average 34 miles per hour for the entire trip? (in miles per hour)
选项 A、29
B、30
C、31
D、32
E、35
答案C
解析 设Tom后来又行驶了x小时，那么根据题意得到：408=34×(x+4)，于是得到x=8。在这8小时内行驶了多少距离呢?408-160=248英里，因此在这段距离内的速度是248/8=31英里/小时，所以选择C。
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