atomickitten atomickitten

16-03-2017
Mathematics

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Jonathan and Samantha row their canoe 39 miles downstream in 3 hours. After a picnic, they row back upstream. After 4 hours they only travel 20 miles. Assuming that they canoe at a constant rate and the river's current is constant, find the speed at which Jonathan and Samantha can row in still water.

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Аноним Аноним

16-03-2017

to find avg downstream is 39/3 = 13 mph
upstream is 20/4 = 5mph

the average of the 2 is the still water speed which is 8 mph

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