The traffic lights at three different signal points change after every – McqOptions

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1.	The traffic lights at three different signal points change after every 45 seconds, 75 seconds and 90 seconds respectively. If all change simultaneously at 7:20:15 hours, then they will change again simultaneously at=?
A.	:28:00 hours
B.	:27:45 hours
C.	:27:30 hours
D.	:27:50 hours
Answer» C. :27:30 hours

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