Question

The traffic lights at three different road
crossings change after 24 seconds, 36 seconds
and 54 seconds respectively. If they all change
simultaneously at 10:15:00 AM, then at what
time will they again change simultaneously?​

Answer 1

Answer:

2)24,36,54

3 ) 12, 18,27

2 ) 4, 6, 9

3) 2, 3,9

2, 1, 3

Lcm=2l6

216 seconds 216/60=3min 36 sec

10.15 AM +3 min 36 sec-=10.18:36

.. = 10.18:36 AM. Ans