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Mathematics, 25.11.2019 20:31 adibakawsar

Achef can finish a catering job in 6 hr. his student can do the same job in 12 hr. how long will it take them to do the job if they work together?

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Achef can finish a catering job in 6 hr. his student can do the same job in 12 hr. how long will it...
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