In still water, your small boat average 8 miles per hour. It takes you the same amount of time to travel 15 miles downstream, with the current, as 9 miles upstream, against the current. What is the rate of water's current? Date of Exam November 2018 Subject Mathematics, Surveying and Transportation Engineering Problem In still water, your small boat averages 8 miles per hour. It takes you the same amount of time to travel 15 miles downstream, with the current, as 9 miles upstream, against the current. What is the rate of water's current? A. 4 miles/hr C. 2 miles/hr B. 3 miles/hr D. 5 miles/hr Answer Key Click here to show or hide the answer key [ C ] Solution Click here to expand or collapse this section Let y = rate of the water-current $t_\text{15 miles going downstream} = t_\text{9 miles going upstream}$ $\dfrac{15}{8 + y} = \dfrac{9}{8 - y}$ $y = 2 \text{ mph}$ ← answer Category Algebra Motion Related Problems Going Downstream Going Upstream Speed of the Water Current Log in or register to post comments
