Calculate how many seconds it will take for 4 bells to toll together again, given that they begin to toll together respectively at the intervals of 5, 6, 10 and 12 seconds. ?  Options:	A) 61	B) 60	C) 79	D) 70	E) 78
LCM of 5, 6, 10 and 12 is   60   LCM=60   ANSWER:60
<result>B</result>
Calculate how many seconds it will take for 4 bells to toll together again, given that they begin to toll together respectively at the intervals of 5, 6, 10 and 12 seconds. ?