SOLUTION: The speed of a stream is 5 mph. A boat travels 9 miles upstream in the same time it takes to travel 19 miles downstream. What is the speed of the boat in still water?
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Question 1205976: The speed of a stream is 5 mph. A boat travels 9 miles upstream in the same time it takes to travel 19 miles downstream. What is the speed of the boat in still water?
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!
Let x be the speed of the boat in still water. Then x+5 is its speed downstream and x-5 is its speed upstream.
The times are the same, so the ratio of distances is the same as the ratio of speeds:
ANSWER: 14mph
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