Two lighthouse

can be seen from the top of the hill the first flashes once every six seconds and the other flashes every once every 15 seconds is the flash how long is it until the first again at the same time

Question

Felipe

Mathematics

13 February, 05:46

Two lighthouse

can be seen from the top of the hill the first flashes once every six seconds and the other flashes every once every 15 seconds is the flash how long is it until the first again at the same time

+4

Answers (2)

Know the Answer?

Stephen Snow · Answer 1

30 seconds.

Step-by-step explanation:

This will be equal to the lowest common multiple of 6 and 15.

6 = 2 * 3

15 = 3 * 5

The LCM = 2*3*5 = 30.

Answer : 30 seconds.

Finnegan Porter · Answer 2

30 seconds

Step-by-step explanation:

suppose they flash together the first time at time t1

they will flash together again on the first multiple of t1 that is common to the two lighthouses which is 30

15*2=30

6*5 = 30

Two lighthousecan be seen from the top of the hill the first flashes once every six seconds and the other flashes every once every 15 seconds is the flash how long is it until the first again at the same time

Two lighthouse

can be seen from the top of the hill the first flashes once every six seconds and the other flashes every once every 15 seconds is the flash how long is it until the first again at the same time