SOLUTION: A boat travels 105 km downstream in 5 hours. The return trip upstream takes 7 hours. Find the speed of the boat in still water and the speed of the current.

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A boat travels 105 km downstream in 5 hours. The return trip upstream takes 7 hours. Find the speed of the boat in still water and the speed of the current.      Log On


   

Question 1048536: A boat travels 105 km downstream in 5 hours. The return trip upstream takes 7 hours. Find the speed of the boat in still water and the speed of the current.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
r + c = 21mph 105%2F5
r - c = 15mph 105%2F7
2r = 21 + 15
2r = 36
r = 18mph
c = 3mph 18+%2B+c+=+21