SOLUTION: Sally paddled her kayak upstream in a river for 2.5 hours. She returned that afternoon in 1.5 hours. If the river is flowing at 2.5km/h, find: a) her paddling speed in still wate

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Question 1166528: Sally paddled her kayak upstream in a river for 2.5 hours. She returned that afternoon in 1.5 hours. If the river is flowing at 2.5km/h, find:
a) her paddling speed in still water
b) the distance she travelled upstream
Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
                 SPEED      TIME      DIST.

UPSTR            r-2.5      2.5      (2.5)(r-2.5)

DOWNSTR          r+2.5      1.5     (1.5)(r+2.5)

The two distances are equal. Either distance expression will give the one-way distance.