SOLUTION: A crew of 8 can row 20 kilometers/hour in still water. The crew rows upstream and then returns to its starting point in 15 minutes. If the river is flowing at 2 kilometers/hour,

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A crew of 8 can row 20 kilometers/hour in still water. The crew rows upstream and then returns to its starting point in 15 minutes. If the river is flowing at 2 kilometers/hour,       Log On


   

Question 353950: A crew of 8 can row 20 kilometers/hour in still water. The crew rows upstream and then returns to its starting point in 15 minutes. If the river is flowing at 2 kilometers/hour, how far upstream did the crew row?
Please be detailed in your answer, Thank You!
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
time = distance / rate ___ the times (up and down) sum to 1/4 hr

[d / (20 - 2)] + [d / (20 + 2)] = 1/4