Question

A boat traveled 210 miles downstream and back. The trip downstream took 10 hours. The trip back took 70 hours. What is the speed of the boat in still water. What is the speed of the current?
If the boat's speed is b and the current's speed is c, then since distance = speed * time,

10(b+c) = 210
70(b-c) = 210

Now just solve for b and s.
20

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