Question

Three traffic lights change after 36,42,72 seconds. At what time will they change simultaneously

Answer 1

Answer:

Thus, the LCM of 36, 42, and 72 = 2^3 x 3^2 x 7^1 = 504. Let's now convert 504 seconds into minutes and seconds. 504 seconds = 504/60 minutes = 8 24/60 minutes = 8 minutes and 24 seconds. Since the lights started at 9 a.m., they will simultaneously change at 9:08:24.

Answer 2

Answer:

the LCM of 36, 42, and 72 = 2^3 x3^2 x 7^1 = 504. Let's now convert 504seconds into minutes and seconds. 504seconds = 504/60 minutes = 8 24/60 minutes = 8 minutes and 24 seconds.Since the lights started at 9 a.m., they will simultaneously change at 9:08:24.