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pratu043

  • 3 years ago

Four bells first begin to toll together and then at intervals of 6, 7, 8 and 9 seconds respectively. Find how many times the bells toll together in two hours and at what intervals they toll together?

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  1. sauravshakya
    • 3 years ago
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    First find L.C.M of 6,7,8 and9

  2. pratu043
    • 3 years ago
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    ok. 504.

  3. sauravshakya
    • 3 years ago
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    Are u sure

  4. sauravshakya
    • 3 years ago
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    ya... thats right

  5. sauravshakya
    • 3 years ago
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    So, the four bells will ring afer 540 seconds all together

  6. sauravshakya
    • 3 years ago
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    got it?

  7. pratu043
    • 3 years ago
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    504.

  8. sauravshakya
    • 3 years ago
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    now, 2 hour = ---- seconds

  9. pratu043
    • 3 years ago
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    But it says they ring together at intervals of 6, 7, 8, 9 seconds.

  10. pratu043
    • 3 years ago
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    So what have these numbers got to do with 504?

  11. sauravshakya
    • 3 years ago
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    Since the Four bells first begin to toll together and then at intervals of 6, 7, 8 and 9 seconds respectively

  12. sauravshakya
    • 3 years ago
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    they will ring together after 540 seconds now

  13. sauravshakya
    • 3 years ago
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    PLZ read the question carefully

  14. pratu043
    • 3 years ago
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    So after that nine seconds, they will ring together after 504 seconds?

  15. sauravshakya
    • 3 years ago
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    nope.....

  16. pratu043
    • 3 years ago
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    Lets say they ring together first at 6.00.00. Then at 6.00.06 6.00.07 6.00.08 6.00.09 right?

  17. sauravshakya
    • 3 years ago
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    nope.....

  18. sauravshakya
    • 3 years ago
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    Let me first expalin the question

  19. sauravshakya
    • 3 years ago
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    there are four bells|dw:1344785837617:dw|

  20. sauravshakya
    • 3 years ago
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    which ring together at first

  21. sauravshakya
    • 3 years ago
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    then BELL A rings after 6 seconds, BELL B rings after 7 seconds , BELL C rings after 8 seconds and BELL D rings after 9 seconds

  22. sauravshakya
    • 3 years ago
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    got it?

  23. pratu043
    • 3 years ago
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    yep i got it now.

  24. sauravshakya
    • 3 years ago
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    so what do u think 540seconds means

  25. pratu043
    • 3 years ago
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    2 hours = 2 * 60 * 60 seconds = 3600 * 2 = 7200 seconds

  26. pratu043
    • 3 years ago
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    The three bells will ring TOGETHER every 504 seconds right?

  27. sauravshakya
    • 3 years ago
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    right

  28. pratu043
    • 3 years ago
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    OK, I know how to do it now. Thanks!!

  29. sauravshakya
    • 3 years ago
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    WELCOMX

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