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The traffic lights at three different road crossing change after every 48 seconds 72 second hand 108 seconds respectively if they changed simultaneously

at 7 am what time will they simultaneous again


Take the lcm of time then they will be simult
that is lcm of 48 s,72s,108s = 5616 sec = 1 hr 33 min 36 sec
if thay start at 7 AM they will be simultaneous at 8.33.36 AM
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