



 
Hi Jessica, Suppose that the speed of the boat is still water is b miles per hour. Thus going upstream her speed is b  2 miles per hour and hence the time it takes to travel upstream 20 miles is given by time upstream = 20/(b  2) hours. Find the time it takes her to travel 20 miles downstream and add the two times to obtain the total time of 5 1/3 hours. This is an equation in b. Solve for b. I hope this helps, Penny  


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