Question 9 Answer & Explanation - SAT Algebra

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algebra

Two cars are 400 miles apart. They travel towards each other. Car A is 20 mph faster than Car B. They meet in 4 hours. What is Car A's speed?

Correct Answer: D

Choice Ahoice C is the correct answer.

Define: $B = x$ , $A = x + 20$ .
Equation: $4x + 4(x + 20) = 400$
Simplify: $4x + 4x + 80 = 400 \rightarrow 8x + 80 = 400$
Subtract 80: $8x = 320 \rightarrow x = 40$
Car A: $40 + 20 = 60$

Choice Ahoice B is incorrect because this is Car B.

Choice Ahoice D is incorrect because calculation error.

Choice Ahoice C is incorrect because calculation error.

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