Algebra practice question

Answer: 2

Downstream speed is 14 km/h and upstream speed is 10 km/h. With boat speed b and current c: b + c = 14 and b − c = 10, so c = 2.

Common wrong answers

If you answered 4

4 is the difference between the two speeds, which is twice the current.

If you answered 12

12 is the boat's speed in still water.

If you answered 14

14 is the downstream speed.

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