Question 276456:  A whistle blows every 14 minutes and a bell rings every 12 minutes. If the whistle and bell both sound together at 12 :00 noon, at what time, afternoon, will they first sound together again ? 
 
 Answer by checkley77(12844)      (Show Source): 
You can  put this solution on YOUR website! You need to find the lowest common multiple of these 2 times. 
14,28,42,56,70,[84],98,112,126,140 
12,24,36,48,56,60,72,[84] 
84 minutes after noon 0is the answer. 
12:00+0:84=1:24 is the time of the next joint whistle blowing & bell ringing. 
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