Posted by **Anonymous** on Thursday, April 7, 2011 at 12:13am.

A bell rings every 2 hours, a second bell rings every 3 hours, and a third bell rings every 4 hours. If all 3 bells ring at 9:00 AM. , at what time will all 3 bells next ring?

- math -
**drwls**, Thursday, April 7, 2011 at 12:53am
The LCM of 2, 3 and 4 is 12.

Therefore you must wait 12 hours, until 9:00 PM.

- math -
**AKSHATH**, Monday, November 21, 2016 at 9:13am
THERE WALL CLOCK ARE THE ROOM ALL THE CLOCK RINGING TOGETHER AT 6 OCLOCK IN THE MORNING AFTER THAT1ST CLOCK RINGS ONCE FOR EVERY 20 MINUTES & 2ND CLOCK RINGS ONCE FOR EVERY 30 MINUTES & 3RD CLOCK RINGS FOR EVERY 40MINUTES WHAT WOULD BE THE TIME AT WHICH ALL THE CLOCK RING TOGETHER FOR THE SECOND TIME.

WHAT IS THE FORMULA...& WHAT IS THE ANSWER..

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