1.
Line l1l_1 through (2,6,2)(2,6,2) perpendicular to 2x+y2z=102x+y-2z=10. Shortest distance between l1l_1 and x+12=y+43=z2\frac{x+1}{2}=\frac{y+4}{-3}=\frac{z}{2} is