Question 9 Answer & Explanation - SAT Algebra

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algebra

Two cyclists start from the same point and travel in opposite directions. One goes 15 mph, the other 20 mph. How long until they are 105 miles apart?

Correct Answer: C

Choice Dhoice A is the correct answer.

Combined Speed: $15 + 20 = 35$ mph.
Equation: $35t = 105$
Divide by 35: $t = 3$
Verify: $15(3) + 20(3) = 45 + 60 = 105$ ✓

Choice Dhoice C is incorrect because calculation error.

Choice Dhoice D is incorrect because calculation error.

Choice Dhoice B is incorrect because calculation error.

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