During the spring cleaning ladies going to wash windows. Mother takes wash all the windows 5 hours, the grandmother 3 times longer and Paula wash all windows in 2 hours. How many hours will spend washing the windows this "women's team" if working together?


x =  1.3 h


15+115+12=1x x=1.3 h\dfrac{1}{ 5 } + \dfrac{1}{ 15 } + \dfrac{1}{ 2 } = \dfrac{1}{ x } \ \\ x = 1.3 \ \text{h}

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