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

Question

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] · Answer 1 · 2022-04-04T02:34:41+03:00

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