Question

15. There are three bells which ring after 30 min, 80 min and 90 min, respectively. If last time they rang simultaneously at 8:30 am. At what time they will again ringing simultaneously?​

Answer 1

Answer:

8:30 pm

Step-by-step explanation:

LCM of 30, 80 and 90 = 720 min

All the bells ring simultaneously after 720 i.e.

So, after 8:30 am, they will again ring simultaneously at 8:30 pm.