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Mathematics, 13.01.2020 20:31 gladysspeedie3oxu2ce

Aperson x can clean up all of the crime in a city in 10 hr working alone. person y can do the same job alone in 12 hr. if person y starts crime fighting at 9 a. m. and person x joins him at 10 a. m., at what time will they have all the crime cleaned up?

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