A bell rings every 18 minutes. A second bell rings every 24 minutes. A third bell rings every 32 minutes. If all the three bells ring at the same time at 8 o’clock in the morning, at what other time will they all ring together ?

• A. 12 ∶ 40 hrs
• B. 12 ∶ 48 hrs
• C. 12 ∶ 56 hrs
• D. 13 ∶ 04 hrs