The traffic lights at four different road crossings change after every 52 seconds, 65 seconds, and 78 seconds respectively. If they change simultaneously at 5 a.m., when will they change simultaneously again?
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In this case
We find the L.C.M of 52,78,65
L.C.M of 52,78,65 is 780
Hence the traffic light change simultaneously again after 780seconds.
We find the L.C.M of 52,78,65
L.C.M of 52,78,65 is 780
Hence the traffic light change simultaneously again after 780seconds.
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