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selma

  • 4 years ago

One pump can drain a pool in 7 minutes. When a second pump is also used, the pool only takes 5 minutes to drain. How long would it take the second pump to drain the pool if it were the only pump in use? Round your answer to the nearest tenth. a) 33.0 minutes b) 2.9 minutes c) 17.5 minutes d) 24.1 minutes

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  1. selma
    • 4 years ago
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    please someone help me :(

  2. pythagoras123
    • 4 years ago
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    The answer is (c).

  3. selma
    • 4 years ago
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    how is it c?

  4. pythagoras123
    • 4 years ago
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    See: A can drain 1/7 of the pool in a minute. A and B can drain 1/5 of the pool in a minute. B can drain 1/7 - 1/5 of the pool in a minute Thus B can drain 2/35 of the pool in a minute. 35/2 is 17.5 minutes. Hence the answer is (c).

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