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If Mr. David does a job in x hours and Mr. Ludwig in y hours. What part of the job they could do together if they worked for k hrs?
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If Mr. David does a job in x hours and Mr. Ludwig in y hours. What part of the job they could do together if they worked for k hrs?

User Cwhsu
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1 Answer

6 votes

Answer:

(1/x + 1/y)k is the answer :)

User BlackMouse
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