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1. |
Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10, 12 seconds respectively. In 30 minutes, how many times do they toll together ? |
A. | 16 times |
B. | 19 times |
C. | 21 times |
D. | 24 times |
Answer» B. 19 times | |