The traffic lights at three different squares on the same big road turn green every 60 seconds, 120 seconds and 24 seconds. When the signals were switched on at 8 o’clock in the morning, all the lights were green. How long after that will all three signals turn green simultaneously again
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0
Answer:
60
+ 120
+ 24
=204 = 3mins 24 sec
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2
Answer:
So, all three signals turn green simultaneously again after a time interval which is the LCM of 60 seconds, 120 seconds, and 24 seconds. Multiples of 24: 24, 48, 72, 96, 120, 144, 168,... Common multiples of 60, 120, and 24: 120, 240,... Thus, all three signals turn green simultaneously again after 120 seconds.
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