Math Olympiad Contest Problems for Elementary and Middle Schools: #69 [HD]

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Three water pipes are used to fill a swimming pool. The first pipe alone takes 5 hours to fill the pool, the second pipe alone takes 15 hours to fill the pool, and the third pipe alone takes 30 hours to fill the pool. If all three pipes are opened at the same time, how long will it take to fill the pool?

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Mathematics
math contests
math
olympiad
middle school
elementary school
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