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
