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Let vec A=hat i-3hat j+4hat k,vec B=6hat...

Let `vec A=hat i-3hat j+4hat k,vec B=6hat i+4hat j-8hat k,vec C=5hat i+2hat j+5hat k` and vector `vec R` satisfies `vec R timesvec B=vec C timesvec B,vec R*vec A=0` ,then the value of `(|vec B|)/(|vec R-vec C|)` is

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