2. 外语
  3. A buzzer sounds every 15 minutes. If the buzzer sounded at 12:40, which of the following could be a time at which the buzzer sou

A buzzer sounds every 15 minutes. If the buzzer sounded at 12:40, which of the following could be a time at which the buzzer sou

admin2009-05-19  70
问题 A buzzer sounds every 15 minutes. If the buzzer sounded at 12:40, which of the following could be a time at which the buzzer sounded?
选项 A、4:05
B、5:30
C、6:45
D、7:15
E、8:10
答案E
解析 一蜂鸣器每15分钟响一次，若该蜂鸣器在12：40响了，问下面哪一个可以是蜂呜器响的时间?
解：本题的正确答案是(E)。蜂鸣器12：40响后，根据题意可知该蜂鸣器只有在12：40+15n时才会再响，其中，n为整数，也即蜂鸣器可能响的时间可能是一个小时中的55分、10分、25分和40分，由此可知五个选项中只有(E)满足这一条件。
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