%_Six bells start ringing together and ring at intervals of 4, 8, 10, 12, 15 and 20 seconds respectively. how many times will they ring together in 60 minutes ?_%

%_Six bells start ringing together and ring at intervals of 4, 8, 10,

1.	%_Six bells start ringing together and ring at intervals of 4, 8, 10, 12, 15 and 20 seconds respectively. how many times will they ring together in 60 minutes ?_%
A.	31
B.	15
C.	16
D.	30
Answer» B. 15