anonymous
  • anonymous
A boy can row a boat at a constant rate of 5 mi/hr in still water. He rows upstream for 15 minutes and downstream, returning to his starting point in another 12 minutes. What is the rate of the current? What is the total distance traveled?
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
15/60 = D/(5-C) 12/60 = D/(5+C) C = CURRENT RATE D = 1/2 TOTAL DISTANCE
anonymous
  • anonymous
Rate * Time = Distance. Solve the following for c, the speed of the current in miles/hour:\[(5-c)\frac{15}{60}\text{ = }(5+c)\frac{12}{60}\]\[\left\{c\to \frac{5}{9}\right\} \]c = 5/9 mph\[\text{distance} =\left(5-\frac{5}{9}\right)\frac{15}{60}=\frac{10}{9}=1.11\text{miles} \]

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