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Google Interview Riddle

Google Interview Riddle - 23 September

How many times do a clock's hands overlap in a day ?

For Solution : Click Here

18 comments:

  1. the answer is 22 times in a day

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  2. After ever 1:05 hrs (and some seconds) clock's hands overlap. So there are 22 overlaps. Ignoring the start and end overlapping.

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  3. answer is 22 times.

    Additional Details
    Just hour & minute hands
    5 years ago

    Its not 24
    5 years ago

    I repeat, it's NOT 24
    5 years ago

    The hands overlap every 12/11 hour. So here are the times that they overlap:

    1. midnight
    2. 1 + 1/11 am
    3. 2 + 2/11 am
    4. 3 + 3/11 am
    5. 4 + 4/11 am
    6. 5 + 5/11 am
    7. 6 + 6/11 am
    8. 7 + 7/11 am
    9. 8 + 8/11 am
    10. 9 + 9/11 am
    11. 10 + 10/11 am
    12. noon
    13. 1 + 1/11 pm
    14. 2 + 2/11 pm
    15. 3 + 3/11 pm
    16. 4 + 4/11 pm
    17. 5 + 5/11 pm
    18. 6 + 6/11 pm
    19. 7 + 7/11 pm
    20. 8 + 8/11 pm
    21. 9 + 9/11 pm
    22. 10 + 10/11 pm

    If midnight is considered part of both days, then the answer is 23 times.Otherwise the answer is 22 times.

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  4. it is 22 times in a day!!

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  5. The clocks hands are placed one on top of the other so there is ALWAYS overlap.

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  6. This comment has been removed by the author.

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    Replies
    1. fuck you......asshole!!

      Delete
  7. never seen a clock with hands

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  8. 22 TIMES

    AM
    12:00
    01:05
    02:10
    03:15
    04:20
    05:25
    06:30
    07:35
    08:40
    09:45
    10:50
    11:55

    PM
    12:00
    1:05
    2:10
    3:15
    4:20
    5:25
    6:30
    7:35
    8:40
    9:45
    10:50
    11:55

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  9. i think its 24 a day

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  10. Answer is 2.

    All the 3 hands will only meet at 12 in the morning and 12 in night. (i.e 12AM and 12PM) No hands will meet at anytime other than that. if you tell 1.05 hour hand will move slightly from 1. similarly for all. If the time is not set properly(i.e while setting the time second hand is not in 12:00) 3 Hands will never overlap.

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