upstream her speed of 2.4 is decreased by 0.6 to 1.8mph. 2.7mph/1.8m = 1.5 hours downstream her speed is incresed to 3 mph. 2.7/3 = 0.9 hours
Fran will take 1.5 hours to swim 2.7 miles upstream and 0.9 hours to swim the same distance downstream.
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