Question

Two lighthouses flash their lights every 20s and 30s respectively. Given that
they flash together at 7 pm when will they next flash together?

Answer 1

Answer:

7 pm 1 min

Step-by-step explanation:

hey mate !! your explaination of answer Is here

First take out L.C.M of 20 and 30

That means they will flash together at every 60s

So,

60s = 1 min

7:00 + 1 = 7 :01 pm

Hope it may have help you

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