Posted by **Britney** on Tuesday, December 7, 2010 at 11:08pm.

A family is moving and has a number of electronic devices in the same packing crate. One of the devices beeps every 8 minutes, another device beeps every 10 minutes, and a third device beeps every 12 minutes. If all the devices beeped together at 3:00pm, what time will they all beep together next?

- Math -
**Reiny**, Tuesday, December 7, 2010 at 11:12pm
What is the LCM for 8, 10 , and 12 ?

- Math -
**Jen**, Tuesday, December 7, 2010 at 11:15pm
LCM, not GCF

- Math -
**Britney**, Tuesday, December 7, 2010 at 11:17pm
Not sure, 120?

- Math -
**Jen**, Tuesday, December 7, 2010 at 11:24pm
Right. So what's 120 minutes from 3:00?

- Math -
**Reiny**, Tuesday, December 7, 2010 at 11:24pm
first device: 8 16 24 .... 120

2nd device : 10 20 30 ... 120

3rd device: 12 24 36 ... 120

so 120 minutes from now they coincide

120 min = 2 hours

so at 5:00 all 3 will peep at the same time

- Math -
**Britney**, Tuesday, December 7, 2010 at 11:33pm
thank you!

## Answer this Question

## Related Questions

- window XP - Windows XP Professional can accommodate the addition and removal of ...
- Information Technology - Apeart from the computer, what three electronic devices...
- math - Three clocks were set to ring at intervals as follows: the first after ...
- Physical Science - Hello, Can someone tell me if I have the correct answer? ...
- math - two runners jog around an oval path at constant rates, but in opposite ...
- Electricity and Electronics - A complete circuit contains two parallel-connected...
- algebra - Two runners jog around an oval path at constant rates, but in opposite...
- algebra - two runners jog around an oval path at constant rates, but in opposite...
- algebra - Two runners jog around an oval path at constant rates, but in opposite...
- BIS 155 - You own a small computer service company with only 2 employees. You ...

More Related Questions