Question

There are 2 flashlights, one flashes every 3 seconds and the other flashes every 4 seconds. If they last flashed on 10:40 am together, when are they going to flash next together? Is the answer 10:42 am??

Answer 1

It is still 10:40:12 am

Explanation:

First find the Lcm. That will be 12. 12 cannot be converted into minutes so it will be in seconds. So it will flash again 12 seconds later...

Answer 2

Answer: 10:52 AM

Explanation:

If you find the LCM of the numbers, and then add it to the last time they flashed together, you will have your answer.