Question

there is 3 lightship flash at 6 AM,first flash every 22 second ,second flash every 30 second and the third flash every 66 seconds.At what time will the three lightship flash together?

Answer 1

Answer:

Three lightships flash simultaneously at 6;00 a.m. The first lightship flashes every 12 seconds, the seconds lightship every 30 seconds and the third lightship every 66 seconds. 

Then we take common multiple of 12,30 or 66 

That is 2×6×5×11=660

So  the three lightships next flash together=660 seconds =60660=11mints

The time next flash is after 11 mints=6.11 A.M

Step-by-step explanation:

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