Hi

Monica can type a proposal in 3 hours. while jose can type the same proposal in 5 hrs. 

How longwould it take them to type the proposal if they work together?

Question states*** PER hr KEY

  1/3 + 1/5 = 1/x      |Multiplying thru by 15x so as all denominators = 1

     5x + 3x = 15    Solve for x 

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