The traffic lights at three different road crossings change after every 48sec, 72sec and 108 sec respectively. If they all change simultaneously at 8:20:00 hours, when will they again change simultaneously? explain in detail
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Answer:
LCM of 48, 72, 108 = 432
So first one changes 9 times (8+1), 2nd one changes 6 times (5+1) and 3rd one changes 4 times (3+1) within 432 second and on that point of moment all 3 will again simultaneously change.
And time would be 8.20+ 432 second (7 min 12 second) = 8 hr 27 min 12 second
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