Question

A blue light flashes every 8 minutes while a pink light flashes every 54 minutes. Both lights flash together at 2 pm. When is the next time that both lights will flash together again?

Answer 1

Find the Prime Factors:

8 = 2³

54 = 2 x 3³

Find the LCM:

LCM = 2³ x 3³ = 216 mins

Convert mins to hours and minutes:

216 mins = 3 hours 36 mins

Find the net time both lights flashes together:

2pm + 3 hours 36 min = 5:36 pm

Answer: It will be 5:36 pm when they flash together again.

Answer 2

Answer:

5:36

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