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Two lighthouses flash their lights every 20 seconds and 30 seconds respectively. Given that they flash together at 8 p.m., when will they next flash together?

Two lighthouses flash their lights every 20 seconds and 30 seconds respectively. Given that they flash together at 8 p.m., when will they next flash together?
asked 76.2k views
2 votes
Two lighthouses flash their lights every 20 seconds and 30 seconds respectively. Given that they flash together at 8 p.m., when will they next flash together?

asked
User Sethammons
by
7.5k points

1 Answer

2 votes
In 60 seconds or at 8:01 pm
answered
User Brian Bulkowski
by
8.6k points
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