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Three alarm clocks ring their alarms at ...

Three alarm clocks ring their alarms at regular intervals of 20min, 25 min and 30 min respectively. If they first beep together at 12 noon, at what time will they deep again for the first time?

A

`4:00`pm

B

`4:30`pm

C

`5:00`pm

D

`5:30` pm

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