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?

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asked Jan 24, 2021 76.2k views

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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?

Mathematics
high-school

Sethammons asked

by Sethammons

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In 60 seconds or at 8:01 pm

Brian Bulkowski answered Jan 29, 2021

by Brian Bulkowski

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