If 18 pumps can deliver 2170 tonnes of water in 10 days , running 7 hours a day , in how many days will 16 pumps can deliver 1736 tonnes, running 9 hours per day?

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If 18 pumps can deliver 2170 tonnes of water in 10 days , running 7 hours a day , in how many days will 16 pumps can deliver 1736 tonnes, running 9 hours per day?