# Work

First paver pave pavement for 27 hours. Second for 27 hours. Started first paver and after 4 hours, join the second. How long will they finish pavement?

Correct result:

x =  15.5

#### Solution:

$4 \cdot \dfrac{1}{ 27} + (x-4) \cdot (\dfrac{1}{ 27} + \dfrac{1}{ 27 }) = 1 \ \\ \ \\ x = 4 + \dfrac{ 27\cdot (27-4) }{ 27+ 27} = 15.5$

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