Question 8 Answer & Explanation - SAT Algebra

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algebra

A boat goes 15 mph in still water. The current is 5 mph. How long to go 40 miles upstream?

Correct Answer: A

Choice Bhoice C is the correct answer.

Upstream Speed: $15 - 5 = 10$ mph.
Equation: $10t = 40$
Divide by 10: $t = 4$

Choice Bhoice D is incorrect because calculation error.

Choice Bhoice C is incorrect because calculation error.

Choice Bhoice A is incorrect because calculation error.

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