The traffic lights at three different road crossings change after every 22 sec., 66 sec and 120 sec respectively. If they all change simultaneously at 9:10:00 hours, then at what time will they again change simultaneously?
Solution: Required time of change simultaneously= (L.C.M. of 22, 66, 120)sec.= 1320 sec.
i.e., 22 min.
Hence, next simultaneous change will take place at 9:32:00 hrs.
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