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The traffic lights at three different roads crossing changes after 48,72 and 108seconds, respectively. If they change simultaneously at 7am,then at what time will they change simultaneously again

Posted by Safeeq Ahamed 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Ram Kushwah 6 years, 10 months ago

{tex}\begin{array}{l}48=16\;\times3=2^4\times3\\72=8\times9=2^3\times3^2\\108=4\times27=2^2\times3^3\\LCM=2^4\times3^3=16\times27=432\end{array}{/tex}

Lights will change simultaneous after 432 sec

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