jennysowu jennysowu

15-08-2022
Mathematics

Answered

A can do a piece of work in r days and B, who works faster, can do the same work in s days. Which of the following expressions, if any, represents the number of days it would take the two of them to do the work if they worked together?
A) (r+s) / 2
B) r-s
C) 1/r + 1/s
D) rs / (r+s)

Answer :

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