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Algebra
Question

If the rate of a boat in still water is $$10 mph$$ and the rate of the current of a river is $$x mph$$ , what is the rate of the boat in each case?

(a) The boat is going upstream (that is, against the current, which slows the boat down).

(b) The boat is going downstream (that is, with the current, which speeds the boat up).

$$\text { (a) } ( 10 - x ) mph \quad \text { (b) } ( 10 + x ) mph$$