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?

Question 1145931: 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?
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!

(1) His upstream speed is the difference between his speed in still water and the speed of the current.

(2) The time required for the upstream trip is the distance, divided by his upstream speed.

Two simple calculations which you should be able to do....
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