Posted by **Emma** on Tuesday, June 26, 2012 at 11:15pm.

One light flashes every 2 minutes and another light flashes every 3.5 minutes. Suppose both lights flash together at noon. What is the first time after 1 PM that both lights will flash together ?

- MATH -
**Steve**, Tuesday, June 26, 2012 at 11:35pm
every 14 minutes, the lights are in synch. 14*5 = 70 is the lowest multiple of 14 greater than 60.

So, at 1:10 pm they are again together.

- MATH -
**Ajay**, Wednesday, June 27, 2012 at 5:30am
isnt it every 14 minutes meaning at 1:14pm not 1:10pm. Because

2,4,6,8,10,12,14

3.5, 7, 10.5, 14

so they will meet again in every 14 minutes

- MATH -
**Steve**, Wednesday, June 27, 2012 at 10:13am
no, because they started in synch at 12:00. 70 minutes later it's 1:10.

- MATH -
**Stever**, Sunday, February 10, 2013 at 2:01pm
Yup

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