Question

1. Traffic lights at three different road crossing change after 48 seconds, 72 seconds
and 108 seconds respectively. At what time will they change together again if they
change simultaneously at 7 A.M.?​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

L.C.M of 48, 72, 108 = 2 x 2 x 2 x 2 x 3 x 3 x 3 = 432 sec.

After 432 seconds, the lights change simultaneously.

432 second = 7 minutes 12 seconds

Therefore the time = 7 a.m. + 7 minutes 12 seconds

= 7:07:12 a.m.

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