Question

two light houses can be seen frrom the top of a hill. the frist flashes once every 8 seconds ,and the other flashes once every 15 seconds . if they flash at the same time , how long will it be until they flash at the same time ?

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Answer 1

Answer:

Given that the first lighthouse flashes once every 8 seconds and the second one flashes every 15 seconds

We have to find the time during which they both flashes simultaneously.

For this we have to find the LCM of 15 and 8.

LCM of 15 and 8 = 15 × 8

                          = 120

Hence , we can say that both the lighthouses flashes simultaneously every 120 seconds

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