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1. |
Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10, 12 seconds respectively. In 28 minutes, how many times do they toll together. |
A. | 11 times |
B. | 12 times |
C. | 15 times |
D. | 19 times |
Answer» D. 19 times | |