Question

A3. There are three traffic lights that turn red at
regular intervals of 36 seconds, 45 seconds and
60 seconds. If all the three traffic lights turn
red at 9 a.m., at what time will all of them
simultaneously turn red next?​

Answer 1

lcm of 36,45 and 60 is 180

so the time when they change again is 180 seconds

but we need to know the time after 9 am so have to convert seconds into minutes

time =180/60 = 3 minutes

required time = 9am + 3 minutes

=9:03 am

this is the right answer

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