Q 1349567413.     Find the distane between the parallel planes `x-y+3z+5=0; 2x-2y+6z+7=0`

A

`rac{3}{ sqrt{11}}` units

B

`frac{1}{2 sqrt{11}}` units

C

`frac{3}{2 sqrt{11}} ` units

D

`frac{1}{ sqrt{11}}` units

HINT

The distance between the parallel planes `ax+by+cz+d_1=0 and ax+by+cz+d_2=0` is `frac{|d_1-d_2|}{ sqrt{^2+b^2+c^2}}`

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