Hi, 

Let x represent time took to row upstream.  then time downstream would be (6.25hr - x)

d= r*t (distance upstream and downstream the same)

(5mph - 3mph)x = (5mph +3mph) (6.25hr - x)

2x = 8*6.25 -8x

10x =  50hr

x = 5 hr

checking our answer

2mph*5hr = 8mph * 1.25hr = 10 

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