WORKSHEET:MULTIPLES AND FACTORS - SOLUTION EXERCISE 9 |
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9) There are two lighthouses on the top of a hill. The first flashes once every 8 seconds, and the other flashes once every 12 seconds. If they flash at the same time, how long will it take until they flash simultaneously again? | |||

The first lighthouse once every 8 seconds: 8, 16, 24, 32,.. The second lighthouse once every 12 seconds: 12, 24, 36, .. So the solution is 24 seconds LCM = 24 |
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