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it takes janet 9 hours to do a task and it take jancie 10 hours to do the same task how long will it take both of them to do the task together

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janet rate: 1task/9hrs
jancie rate: 1task/10hrs

combinded rate=1task/hr (1/9+1/10)

timecombined=1task/combinded rate

careful with the fractions.

5 hrs

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