(2) Three lighthouses flash their light after every 5 sec, 10 sec and 15 sec. They flash
together at 7:00 p.m. When will they next flash together?
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Answer:
7:01 p.m.
Step-by-step explanation:
1st light house flashes after 5sec
2nd light house flashes after 10sec
3rd light house fleshes after 15sec
They flash together at 7pm
When will they next flash together? = LCM = 30seconds
∴ They will flash after 30secs that is 7:01 p.m.
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