anonymous
  • anonymous
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
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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anonymous
  • anonymous
please someone help me :(
pythagoras123
  • pythagoras123
The answer is (c).
anonymous
  • anonymous
how is it c?

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pythagoras123
  • pythagoras123
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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