2. 外语
  3. One hour after Tom started walking from X to Y, a distance of 45 miles. Bob started walking along the same road from Y to X. If

One hour after Tom started walking from X to Y, a distance of 45 miles. Bob started walking along the same road from Y to X. If

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问题 One hour after Tom started walking from X to Y, a distance of 45 miles. Bob started walking along the same road from Y to X. If Tom’s walking rate was 3 miles per hour and Bob’s was 4 miles per hour, how many miles had Bob walked when they met?
选项 A、24
B、23
C、22
D、21
E、19.5
答案A
解析 假设Bob走了n小时，那么(n+1)×3+n×4=45，得到n=6，Bob共走了4×6=24英里，选择A。
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