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A boat travels 42 km against the current and 72 km with the current in a total time of 8 hours. Additionally, it covers a distance of 56 km in still water in 4 hours. Given that the speed of the current exceeds 1.75 km/h, by what percentage is the boat's speed upstream lower than its speed downstream?

A 15%

B 20%

C 25%

D 30%

E 35%

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