Joe can weed the garden twice as fast as his sister Janet. Together they can weed the garden in 2 hours. How long would it take each of them working alone?

A:[tex]\:\left(\:\frac{1\:}{x}\:\right)\:\cdot 4+\:\left(\frac{1\:}{2x}\:\right)\cdot 2\:=\:1[/tex]

B:[tex]\Large{ ( \frac {1}{x} ) + (\frac {1}{2x} ) = 1}[/tex]

C:[tex]\Large{ ( \frac {1}{x} ) + (\frac {1}{2x} ) = 2}[/tex]

D:[tex]\Large{ ( \frac {1}{x} ) \cdot 2 + (\frac {1}{2x} ) \cdot 2 = 1}[/tex]