Mathematics, 03.12.2021 01:00 ella3714

Alena and Estella can complete a job in 18 hours when they work together. If they invite Tommy to help, how long will the job take? How many friends need to
work together on the job to complete it in 4 hours

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Alena and Estella can complete a job in 18 hours when they work together. If they invite Tommy to help, how long will the job take? How many friends need to work together on the job to complete it in 4 hours

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Another question on Mathematics

Alena and Estella can complete a job in 18 hours when they work together. If they invite Tommy to help, how long will the job take? How many friends need to
work together on the job to complete it in 4 hours