To find out when the two lighthouse lights will flash together again, we need to find the least common multiple (LCM) of 26 and 30.
The prime factors of 26 are 2 and 13.
The prime factors of 30 are 2, 3, and 5.
To find the LCM, we need to take the highest power of each prime factor that appears in either number:
2^1, 3^1, 5^1, 13^1.
Multiplying these prime factors together, we get:
2 * 3 * 5 * 13 = 390.
Therefore, the two lighthouse lights will flash together again after 390 seconds or 6 minutes and 30 seconds.
one lighthouse light flashes every 26 seconds, and a second lighthouse light flashes every 30 seconds. if they both flash at the same moment, how long will it be until they will flash together again
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