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Frank's automobile engine runs at 100°C. On a day when the outside temperature is 29°C, he...

Frank's automobile engine runs at 100°C. On a day when the outside temperature is 29°C, he turns off the ignition and notes that five minutes later, the engine has cooled to 70°C. When will the engine cool to 40°C? (Round your answer to two decimal places.)
______________________ minutes after the ignition was turned off

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