Five bells begin to toll together at 12:00 noon and toll respectively at intervals of 3, 4, 5, 6, and 7 seconds. Not including the toll at 12:00 noon, how many more times will all five bells toll together before 1:00 pm (i.e. one hour later)?  Choose the correct choice from the following answers:
A) 6 B) 8 C) 10 D) 12 E) 14
The least common multiple is 2*2*3*5*7= 
<gadget id="calculator">2*2*3*5*7</gadget>
<output>420</output>
420.   3600 seconds / 420= 8 + remainder.   The answer is 8.
<result>B</result>
Five bells begin to toll together at 12:00 noon and toll respectively at intervals of 3, 4, 5, 6, and 7 seconds. Not including the toll at 12:00 noon, how many more times will all five bells toll together before 1:00 pm (i.e. one hour later)?