18. Five bells first begin to toll together and then at intervals of 5, 10, 15, and 20 and 25 seconds respectively. After what interval of time will they toll again together?
- 5 min
- 5 min
- 2 min
- None
18. Five bells first begin to toll together and then at intervals of 5, 10, 15, and 20 and 25 seconds respectively. After what interval of time will they toll again together?
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