My Grandfathers Clock

  • My Grandfathers Clock

    PoW ID: 784

    Geometry / Measurement, 3rd to 5th, Measurement, Algebra, Algebra, Algebra Library

    Problem Print

    Image784Last weekend, I stayed at my Grandfather's house. He has one of those old Grandfather clocks that chimes on the hour, with the number of chimes equal to the hour. It also chimes once every quarter hour.

    One night, I was awakened by a single chime. I knew for some reason that the single chime I heard was not the last chime of an hourly chime, but I was too tired to get out of bed to see exactly what time it was.

    What would be the longest time I would have to wait to be sure of exactly what time it was? What would be the shortest time I would need to wait?  

    Answer Check

    Show Answer

    The longest I would have to wait would be 1 1/2 hours. The shortest time I would have to wait is 15 minutes.