In a watch shop, there are three clocks which ring at intervals of 15, 20 and
30 minutes respectively. They all ring together at 12 noon. At what time will
they all ring together again?
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Answer:
1 pm
Step-by-step explanation:
timing of all watch
- 12:15pm , 12:30pm , 12:45pm , 1pm
- 12:20pm , 12:40pm , 1pm
- 12:30pm , 1pm
so the next common timing is 1pm
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