Question #58481
the traffic lights at three different road crossing change after every 48 seconds, 72 seconds and 108 seconds respectively. if the change simultaneously at 7 a.m., at what time will they change simultaneously again?
Expert's answer
Answer on Question #58481 – Math – Other
Question
the traffic lights at three different road crossing change after every 48 seconds, 72 seconds and 108 seconds respectively. if the change simultaneously at 7 a.m., at what time will they change simultaneously again?
Solution
The least common multiple of 48, 72 and 108 is 432.
So after 432 seconds (or 7 min. 12 sec.) lights will change simultaneously again.
It will be at 7:07:12 a.m.
Answer: 7:07:12 a.m.
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