When Mary paints a house, it takes her \(4\) hours. When Lisa joins Mary, and they work together, it takes them only

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When Mary paints a house, it takes her \(4\) hours. When Lisa joins Mary, and they work together, it takes them only \(3\) hours to paint a house of the same size. How long would it take for Lisa to paint a house of the same size by herself?

A. \(5\) hours
B. \(6\) hours
C. \(7\) hours
D. \(12\) hours
E. \(20\) hours

The OA is D
Source: — Problem Solving |