SOLUTION: Two smugglers, Bill Bogus and Sally Seadog, have set up signal lights that flash continuously across the ocean. Bill’s light flashes every 5 seconds 5 seconds and Sally’s l

Question 1135516: Two smugglers, Bill Bogus and Sally Seadog, have set up signal lights that flash continuously across the ocean. Bill’s light flashes every
5 seconds
5 seconds
and Sally’s light flashes every
4 seconds
4 seconds
. If they both start together, how long will it take for both lights to flash again at the same time?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
4*5 = 20 seconds
======================
" If they both start together," - as opposed to only one of them starting together?
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