Question

Two lighthouses flash their lights every 20 seconds and 30 seconds respectively . Given that they flashed together at 4:10 pm , when will they next flash together .

Guys please answer this question .​

Answer 1

Answer:

So, we have to find the LCM of 20 and 30. So, the two lighthouses will flash again after 60 seconds(1 minute). So if they flashed together at 4:10 PM then they will again flash together at 4:11 PM.

Answer 2

Answer is 4:11 pm

Step by step explanation

If two lights flashed at the same time then they will again flash together at the LCM of the time they take to flash once.

So we have to find the LCM of 20 and 30

20= 2*2*5

30= 2*3*5

LCM(20,30)= 2*5*3*2

LCM(20,30)= 60

So the two lighthouses will flash again after 60 seconds (1 minute)

So if they flash together at 4:10pm

then they will again flash at 4:11pm

Hope it helps!

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