SOLUTION: Arron’s boat travels 9 mile per hour in still water. The speed of the river is 4 miles per hour. How long will it take Arron to travel 18 miles upstream?

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Question 1145935: Arron’s boat travels 9 mile per hour in still water. The speed of the river is 4 miles per hour. How long will it take Arron to travel 18 miles upstream?
Found 2 solutions by greenestamps, josgarithmetic:
Answer by greenestamps(13200) About Me  (Show Source):
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Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
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Boat travels r mile per hour in still water. The speed of the river is c miles per hour. How long will it take to travel d miles upstream?
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Upstream, boat will travel at r-c miles%2Fhour.

If x is amount of time of travelling asked for, then
%28r-c%29x=d
highlight_green%28x=d%2F%28r-c%29%29