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
7:27:50 hours
7:27:45 hours
7:28:00 hours
7:27:30 hours
A
7:27:45 hours
B
7:27:50 hours
C
7:28:00 hours
D
7:27:30 hours
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Solution
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The correct option is B7:27:45 hours LCM of 45,75 and 90=450 seconds. i.e. 7 minutes 30 seconds. ∴ Required time =7:27:45 hours.
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