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Some decoration lights were programmed at intervals of 40 seconds, 50 seconds, 60 seconds, and 75 seconds. What is the earliest time they will give...

Some decoration lights were programmed at intervals of 40 seconds, 50 seconds, 60 seconds, and 75 seconds. What is the earliest time they will give out light signals simultaneously if the last time they did this was at 9.15 a.m.?

Answers


joseph
40 = 2^3 x 5
50=2 x 5^2
60=2^2 x 3 x 5
75= 3 x 5^2
The least common multiple
2^3 x 3 x5^2
=600 seconds
= 10 minutes
The time will be 10.25 a.m.

joseph rimiru answered the question on October 16, 2017 at 07:31

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