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OpenStudy (anonymous):

A motorboat can go 14 miles downstream on a river in 20 minutes. it takes 30 minutes for this boat to go back upstream the same 14 miles. Find the speed of the boat. How much pure water must be mixed with 9 pints of 50% developer to produce a mixture that is 28% developer? PLEASE I GIVE MEDALS I REALLY NEED TO KNOW HOW TO DO THESE TWO TO STUDY FOR FINALS

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