Posted by **Aisha** on Tuesday, December 11, 2012 at 10:42pm.

A blue light every 30seconds. A red light blinks every 40seconds. If both lights blink at exactly 1:00pm, at what time will they blink at the same time again?

- math -
**Ms. Sue**, Tuesday, December 11, 2012 at 10:53pm
The least common multiple of 30 and 40 is 120.

30, 60, 90, 120

30, 80, 120

1:00 + 120 seconds = ?

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