SOLUTION: The speed of a boat in still water is 10 km/h. The boat travels 12 km upstream and 28 km downstream in a total time of 4 hours. What is the speed of the stream?

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 Question 442916: The speed of a boat in still water is 10 km/h. The boat travels 12 km upstream and 28 km downstream in a total time of 4 hours. What is the speed of the stream?Answer by jorel1380(2518)   (Show Source): You can put this solution on YOUR website!12/(10-x)+28/(10+x)=4 12(10+x)+28(10-x)=400-4x2 120+12x+280-28x=400-4x2 4x2-16x=0 x2-4x=0 x2=4x x=4 The speed of the stream is 4 kph..