Time puzzle

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Supposing a clock takes 7 seconds to strike 7, how long does it take for the same clock to strike 10?

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JamesBond Guru Asked on 26th July 2015 in Interview Puzzles.
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    While striking 7 the clock strikes its first gong at 7 o’clock and it strikes 6 more at regular intervals. These 6 intervals take 7 seconds so that the intervals between gongs is 7/6  seconds. However to
    strike 10 there are 9 intervals each taking 7/6×9 seconds for a total of 10.5 seconds.

    John123 Expert Answered on 26th July 2015.
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