MCQOPTIONS
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| 1. |
Six bells commence tolling together and toll at intervals of 3, 6, 9, 12, 15 and 18 seconds respectively. In 60 minutes, how many times do they toll together ? |
| A. | 10 |
| B. | 20 |
| C. | 21 |
| D. | 15 |
| Answer» D. 15 | |