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Two light houses flash their lights every 30 seconds and 40 seconds respectively. given that they last flashed together at 10:40
a.m., when will they next flash together?

Respuesta :

find the common muliple 120seconds is 2mins herefors 10.42
Apocrophon
If they flash at 30 and 40 seconds, then a diagram showing their timing helps

30, 60, 90, 120
40, 80, 120

So after 120 seconds, both lighthouses flash at the same time
120 sec = 2 minutes

So the answer is 10:42

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