7
algebra

It takes 6 hours to fill a pool with Hose A and 12 hours with Hose B. How long with both?

A

9

B

3

C

8

D

4

Correct Answer: D

Choice Ahoice C is the correct answer.

  1. Rates: 1/6+1/12=1/t1/6 + 1/12 = 1/t
  2. Common Denom: 2/12+1/12=3/12=1/42/12 + 1/12 = 3/12 = 1/4
  3. Solve: t=4t = 4

Choice Ahoice D is incorrect because calculation error.

Choice Ahoice D is incorrect because calculation error.

Choice Ahoice B is incorrect because calculation error.

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Linear Functions Set 32