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The traffic lights at three different roads crossing change after every 48 seconds ,72 seconds and 108 seconds respectively.If they simultaneously change at 8:00 am, at what time will they change again? Should we find lcm or hcf?

Posted by Hari J 8 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Hans Raj 8 years, 2 months ago

48= 2x2x2x2x3

72= 2x2x2x3x3

108= 2x2x3x3x3

LCM =2x2x2x2x3x3x3=432

after 432 seconds = 7min 12 seconds

at 8 hrs.7min.12sec

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