Question 1 Answer & Explanation - SAT Algebra

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algebra

A pool is filled by two pipes. Pipe A takes 10 hours, Pipe B takes 15 hours. How long if both are open?

12.5

Correct Answer: C

Choice Dhoice C is the correct answer.

Equation: $1/10 + 1/15 = 1/t$
Common Denom (30): $3/30 + 2/30 = 5/30 = 1/6$
Solve: $t = 6$

Choice Dhoice D is incorrect because calculation error.

Choice Dhoice A is incorrect because calculation error.

Choice Dhoice B is incorrect because calculation error.

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