The traffic lights at three different road crossings changes after every 48 sec., 72 sec. and 108 sec. respectively. If they all change simultaneously at 8 : 20 : 00 hrs, then they will again change simultaneously at?

The traffic lights at three different road crossings changes after eve

1.	The traffic lights at three different road crossings changes after every 48 sec., 72 sec. and 108 sec. respectively. If they all change simultaneously at 8 : 20 : 00 hrs, then they will again change simultaneously at?
A.	8 : 27 : 12 hrs.
B.	8 : 27 : 24 hrs.
C.	8 : 27 : 36 hrs.
D.	8 : 27 : 48 hrs.
Answer» B. 8 : 27 : 24 hrs.