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abdul_shabeer

  • 2 years ago

A clock gains 2 minutes per day and another loses 3 minutes per day. Both the clocks are started on a correct time at a given instant. They will again show the correct time for an instant within

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  1. abdul_shabeer
    • 2 years ago
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    (a) a week (b) a month (c) six months (d) one year

  2. GT
    • 2 years ago
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    I tried this before but could not formulate the equation. hmmmm....

  3. 14yamaka
    • 2 years ago
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    wait, is this a digital clock? like is it 12 hours or 24 hours we're going for?

  4. abdul_shabeer
    • 2 years ago
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    I think 12 hours clock

  5. 14yamaka
    • 2 years ago
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    one of the easier ways would be is to multiply to figure out the total number of minutes there are in the 12 hours and divide it by 5.

  6. 14yamaka
    • 2 years ago
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    Each day, the clocks have gain a 5-minute gap between each other, so how big does the gap have to be to become 12 hours :)

  7. fewscrewsmissing
    • 2 years ago
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    I would say... 720 minutes per 12 hours, so the 2 minutes clock will be accurate again in 720/2/2 days = 180 days, the -3 minutes clock in 720/3/2 = 120 days. LCM of 180 and 120 is 360, so once a year?

  8. fewscrewsmissing
    • 2 years ago
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    But it's late here so my ability to reason left hours ago =)

  9. FoolForMath
    • 2 years ago
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    Yes once a year is the correct answer.

  10. GT
    • 2 years ago
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    I think that is right......

  11. abdul_shabeer
    • 2 years ago
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    Yes, it matches the answer key

  12. GT
    • 2 years ago
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    Good way to set it up.

  13. 14yamaka
    • 2 years ago
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    oooohhh ok:) its 1:25 in the morning here :S lol

  14. fewscrewsmissing
    • 2 years ago
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    Haha where are you 14yamaka? It's 12:25am here.

  15. 14yamaka
    • 2 years ago
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    japan haha

  16. FoolForMath
    • 2 years ago
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    As we are giving away our local time it's 9:55 PM here.

  17. 14yamaka
    • 2 years ago
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    Where are you FSM?

  18. 14yamaka
    • 2 years ago
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    and where are you Fool?

  19. abdul_shabeer
    • 2 years ago
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    I think FFM is in India

  20. FoolForMath
    • 2 years ago
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    I am from India and FSM is from Australia.

  21. fewscrewsmissing
    • 2 years ago
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    Ah tis but early for you FFM :-P I'm in Perth, Australia.

  22. amir.sat
    • 2 years ago
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    after 3600 days

  23. fewscrewsmissing
    • 2 years ago
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    3600 days = 10 years o.O

  24. 14yamaka
    • 2 years ago
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    whoa, that's 10 years

  25. abdul_shabeer
    • 2 years ago
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    Why the 2 minutes clock will be accurate again in 720/2/2 days?

  26. amir.sat
    • 2 years ago
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    2 minute clock after 1800 days 3 minute clock after 1200 days

  27. abdul_shabeer
    • 2 years ago
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    Is it 1800 or 180?

  28. amir.sat
    • 2 years ago
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    1800

  29. fewscrewsmissing
    • 2 years ago
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    I've shown my reasoning above, I got 180 days. I don't know HOW it could be 1800 or 1200 days, can you elaborate amir.sat?

  30. fewscrewsmissing
    • 2 years ago
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    So...?

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