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In a courtyard, one bell rings every \tfrac{1}{4} hour and another bell rings every \tfrac{1}{5} hour. Both bells ring together at exactly the beginning of each hour. Which of the following gives all of the intervals that occur between any two rings of the bells, in minutes?

  • A

    6 and 9 only

  • B

    3, 6, and 9

  • C

    3, 12, and 15

  • D

    3, 6, 9, and 12

  • E

    3, 6, 10, and 12

显示答案
正确答案: D

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