Two lighthouses can be seen from the top of a hill. The frist flashes once every 6 seconds and the otherflashes once every 15 seconds.

If they flash simultaneously, how long is it until they flash again at the same time?

Question

Mathematics

April Bryant

21 June, 07:59

Two lighthouses can be seen from the top of a hill. The frist flashes once every 6 seconds and the otherflashes once every 15 seconds.

If they flash simultaneously, how long is it until they flash again at the same time?

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Answers (1)

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Kason Holden · Answer 1

30 seconds

Step-by-step explanation:

the second lighthouse flashes every 15 seconds. for the first 15, the other house will not flash because 15/6 is not a whole number. in the next 15 seconds, which is 30 seconds in all, the other will flash because 30/6 is a whole number.

Two lighthouses can be seen from the top of a hill. The frist flashes once every 6 seconds and the otherflashes once every 15 seconds.If they flash simultaneously, how long is it until they flash again at the same time?

Two lighthouses can be seen from the top of a hill. The frist flashes once every 6 seconds and the otherflashes once every 15 seconds.

If they flash simultaneously, how long is it until they flash again at the same time?