document.write( "Question 1093985: On a Christmas tree a first set of ligjts flashes every 3 seconds, a second set of lights flashes every 4 seconds and a third set of lights flaahes every 10 seconds. If the lights all came on at 10:00 am, at what time will they all come on together again? \n" ); document.write( "

Algebra.Com's Answer #708585 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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On a Christmas tree a first set of ligjts flashes every 3 seconds, a second set of lights flashes every 4 seconds and a third set of lights flaahes every 10 seconds.
\n" ); document.write( " If the lights all came on at 10:00 am, at what time will they all come on together again?
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\n" ); document.write( "Find the least common multiple of 3, 4, 10
\n" ); document.write( "Prime factor
\n" ); document.write( "3: 3
\n" ); document.write( "4: 2*2
\n" ); document.write( "10: 2*5
\n" ); document.write( "LCM: 3*2*2*5 = 60 seconds. All light flash on at 10:01
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\n" ); document.write( "At that time, 1st set flashes 20 times, the 2nd 15 times, the 3rd 6 times \n" ); document.write( "

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