Set 8: Linear Equations (Intermediate)

Explanation

Answer: C

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

✓ Correct

12.5

Detailed Explanation

Choice C is correct. Choice C is the correct answer. 1. Equation: $1 /10 + 1/15 = 1/t$ 2. Common Denom (30): $3 /30 + 2/30 = 5/30 = 1/6$ 3. Solve: $t = 6$ Choice D is incorrect because it results from an error in the solution process. Choice A is incorrect because it results from an error in the solution process. Choice B is incorrect because it results from an error in the solution process.

Key Steps:

•

The correct answer is 6

Why others are wrong:

A: Choice A is incorrect and may result from a calculation error.

B: Choice B is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

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