Calculate how many seconds it eill take for 4 bells to toll together again, given that they begin to toll together respectively at the intervals of 5, 8, 11 and 15 seconds. ? Choose the correct choice.
A) 1310  B) 1320  C) 1322  D) 1323  E) 1312
LCM of 5, 8, 11 and 15 is   1320   LCM=1320   ANSWER:1320
<result>B</result>
Calculate how many seconds it eill take for 4 bells to toll together again, given that they begin to toll together respectively at the intervals of 5, 8, 11 and 15 seconds. ?