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It takes two hours for a person $X$ to mow the lawn. $Y$ can mow the same lawn in four hours. How long (in minutes) will it take $X$ and $Y,$ if they work together to mow the lawn$?$

  1. $60$
  2. $80$
  3. $90$
  4. $120$ 
in Numerical Ability by (5.4k points)
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