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A motorboat went 70 miles in 4 hours when traveling at full speed upstream on a river whose current flows at the rate of 6 miles per hour. how fast can the boat travel in still water?


Sagot :

Let 'x' be the speed of boat in still water
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x - 6mph = 70mi/4hr
x - 6mph = 17.5 mph
x = 17.5 + 6 
x = 23.5 mph
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Therefore the boat has a speed of 23.5mph in still water.