Question 6 Answer & Explanation - SAT Algebra

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algebra

A boat goes 20 km downstream in 2 hours and 20 km upstream in 5 hours. What is the speed of the current?

Correct Answer: C

Choice Choice C is the correct answer.

Speeds: Down = $20/2 = 10$ , Up = $20/5 = 4$ .
Equations: $b + c = 10$ , $b - c = 4$ .
Subtract: $2c = 6 \rightarrow c = 3$ .

Choice Choice A is incorrect because this is the boat speed.

Choice Choice B is incorrect because calculation error.

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