Three bells chime at intervals of 18 min., 24 min. and 32 min. respectively. At a certain time they begin together. What length D of time will elapse before they chime together again?
Choose the correct answer
A) 2 hr. and 24 min.  B) 4 hr. and 48 min.  C) 1 hr. and 36 min.  D) 5 hr.  E) 2 hr.
It should be simple. All the three bells will chime again together whenver their time intervals intersect eachother.   So the LCM of the three time intervals (18, 24,32) would be the answer.   LCM (18, 24, 32) D= 288 =&gt; 4 hours 48 mins.4 hr. and 48 min.
<result>B</result>
Three bells chime at intervals of 18 min., 24 min. and 32 min. respectively. At a certain time they begin together. What length D of time will elapse before they chime together again?