SOLUTION: The current of a river is 3miles per hour. A boat travels to a point 36 miles upstream and back in 5 hours. What is the speed of the boat in still water?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: The current of a river is 3miles per hour. A boat travels to a point 36 miles upstream and back in 5 hours. What is the speed of the boat in still water?      Log On


   

Question 1156498: The current of a river is 3miles per hour. A boat travels to a point 36 miles upstream and back in 5 hours. What is the speed of the boat in still water?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Time upstream, 36%2F%28r-3%29

Time back, downstream, 36%2F%28r%2B3%29

Total time 5 hours, 36%2F%28r-3%29%2B36%2F%28r%2B3%29=5; solve this.


highlight%28r=15%29