Machine \(A\) can complete a certain job in \(x\) hours. Machine \(B\) can complete the same job in \(y\) hours. If

This topic has expert replies
Legendary Member
Posts: 1622
Joined: Thu Mar 01, 2018 7:22 am
Followed by:2 members

Timer

00:00

Your Answer

A

B

C

D

E

Global Stats

Machine \(A\) can complete a certain job in \(x\) hours. Machine \(B\) can complete the same job in \(y\) hours. If \(A\) and \(B\) work together at their respective rates to complete the job, which of the following represents the fraction of the job that \(B\) will not have to complete because of \(A\)'s help?

A) \(\dfrac{x - y}{x + y}\)

B) \(\dfrac{x}{y - x}\)

C) \(\dfrac{x + y}{xy}\)

D) \(\dfrac{y}{x - y}\)

E) \(\dfrac{y}{x + y}\)

Answer: E

Source: GMAT Club Tests