Find the shortest distance between lines `bar(r) = (2hat(i) - hat(j)) + lambda (2hat(i) + hat(j) - 3hat(k))` and `bar(r) = hat(i) - hat(j) + 2hat(k) + mu (2hat(i) + hat(j) - 5hat(k))`

Answer

`(1)/(sqrt(5))` unit