Question

Three bells toll together at intervals of 30, 36 and 45 minutes respectively. At what time will they toll together again if they toll simultaneously at 8 A.M?

• A. 2 P.M
• B. 11 A.M
• C. 12 A.M
• D. 1 P.M

Answer 1

The correct option is B

11 A.M

The LCM $=2\times 3\times 3\times 2\times 5=180$ Thus, the three bells will toll together every 180 minutes.

After 180 minutes, that is 3 hours later from 8 A.M, so, at 11:00 AM.