4 bells ring at intervals of 30 minutes, 1 hour, 11/2 hour and 1 hour 45 minutes respectively. All the bells ring simultaneously at 12 noon. They will again ring simultaneously at :

4 bells ring at intervals of 30 minutes, 1 hour, 11/2 hour and 1 hour

1.	4 bells ring at intervals of 30 minutes, 1 hour, 11/2 hour and 1 hour 45 minutes respectively. All the bells ring simultaneously at 12 noon. They will again ring simultaneously at :
A.	12 mid night
B.	3 a.m.
C.	6 a.m.
D.	9 a.m.
Answer» E.