\(A\) and \(B\) can complete a task in \(20\) days. \(B\) and \(C\) can complete the same task in \(30\) days. If \(A\)

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\(A\) and \(B\) can complete a task in \(20\) days. \(B\) and \(C\) can complete the same task in \(30\) days. If \(A\) and \(C\) can complete the task in \(40\) days, arrange the efficiencies of \(A, B,\) and \(C\) in descending order.

A. \(A>B>C\)
B. \(A>C>B\)
C. \(B>A>C\)
D. \(B>C>A\)
E. \(C>A>B\)

Answer: C

Source: e-GMAT
Source: — Problem Solving |