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An indoor water park has two giant buckets that slowly fill with 1000 gallons of water before dumping it on the people below. One buckets dumps water every 18 min. The other buckets dumps water every 21min. It is currently 1:15 p.m. and both buckets dumped water 5 minutes ago. Find the next two times that both buckets dump water at the same time

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Yna9141
5 minutes ago of 1:15 pm is 1:10 pm. This is the last time that both buckets dump water together. The least multiple of both 21 and 18 is 126. Therefore, every after 126 minutes they will dump water together. 

   126 minutes is equal to 2 hours and 6 minutes.

(1) Time 1: 

    1:10 pm + 2:06 = 3:16 pm

(2) Time 2:

    3:16 pm + 2:06 = 5:22 pm

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