SOLUTION: A boat travels 25km/h in still water. If the boat goes upstream in a river flowing at a rate of 7km/h, for 2 km, and then returns downstream to its starting point, what is the aver

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Question 1126156: A boat travels 25km/h in still water. If the boat goes upstream in a river flowing at a rate of 7km/h, for 2 km, and then returns downstream to its starting point, what is the average speed for the while trip in km/h?
Answer by josgarithmetic(39616)   (Show Source): You can put this solution on YOUR website!
                   SPEED     TIME     DISTANCE
upstream          25-7=18    2/18         2        
downstream        25+7=32    2/32         2


Total Distance, 4 kilometers
Total Time,

Average round trip speed,

About 23 kilometers per hour
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