MathDB
Boat in Water

Source:

February 7, 2009
ratio

Problem Statement

A boat has a speed of 15 15 mph in still water. In a stream that has a current of 5 5 mph it travels a certain distance downstream and returns. The ratio of the average speed for the round trip to the speed in still water is: <spanclass=′latex−bold′>(A)</span> 54<spanclass=′latex−bold′>(B)</span> 11<spanclass=′latex−bold′>(C)</span> 89<spanclass=′latex−bold′>(D)</span> 78<spanclass=′latex−bold′>(E)</span> 98 <span class='latex-bold'>(A)</span>\ \frac{5}{4} \qquad <span class='latex-bold'>(B)</span>\ \frac{1}{1} \qquad <span class='latex-bold'>(C)</span>\ \frac{8}{9} \qquad <span class='latex-bold'>(D)</span>\ \frac{7}{8} \qquad <span class='latex-bold'>(E)</span>\ \frac{9}{8}
Back to ProblemsView on AoPS