pratu043
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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sauravshakya
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First find L.C.M of 6,7,8 and9
pratu043
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ok. 504.
sauravshakya
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Are u sure
sauravshakya
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ya... thats right
sauravshakya
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So, the four bells will ring afer 540 seconds all together
sauravshakya
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got it?
pratu043
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504.
sauravshakya
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now, 2 hour = ---- seconds
pratu043
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But it says they ring together at intervals of 6, 7, 8, 9 seconds.
pratu043
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So what have these numbers got to do with 504?
sauravshakya
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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
sauravshakya
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they will ring together after 540 seconds now
sauravshakya
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PLZ read the question carefully
pratu043
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So after that nine seconds, they will ring together after 504 seconds?
sauravshakya
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nope.....
pratu043
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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?
sauravshakya
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nope.....
sauravshakya
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Let me first expalin the question
sauravshakya
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there are four bells|dw:1344785837617:dw|
sauravshakya
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which ring together at first
sauravshakya
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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
sauravshakya
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got it?
pratu043
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yep i got it now.
sauravshakya
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so what do u think 540seconds means
pratu043
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2 hours = 2 * 60 * 60 seconds
= 3600 * 2
= 7200 seconds
pratu043
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The three bells will ring TOGETHER every 504 seconds right?
sauravshakya
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right
pratu043
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OK, I know how to do it now. Thanks!!
sauravshakya
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WELCOMX