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Q:

A pipe can fill a tank in x hours and an another can empty it in y hours. In how many hours will they together fill it. If y>x?

  • 1
    $$ {xy\over y-x}{hrs}$$
  • 2
    $$ {y-x\over xy}{hrs}$$
  • 3
    $$ {2yx\over y-x}{\ hs}$$
  • 4
    Can’t be determined
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Answer : 1. "$$ {xy\over y-x}{hrs}$$"

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