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serg [7]
3 years ago
15

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

ill they next flash together?
Mathematics
1 answer:
Free_Kalibri [48]3 years ago
6 0
One minute later at 8:01pm. One lighthouse will flash 3 times (at 20, 40 and 60 seconds)...the other will flash twice (at 30 and 60 seconds). So they will both flash 60 seconds later, at 8:01
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