Q 1317012889.     The distance between the parallel planes `2x+3y+4z=5` and `4x+6y+8z=12` is ?

A

`2`

B

`frac{1}{sqrt {29}}`

C

`4`

D

`8`

HINT

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

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