a) For 1st form divide both numerator and denominator by 5 and you get
H11(s) = 0.2 / (0.6s + 1)
For the second form divide both numerator and denominator by 3 and you get
H12(s) = 1 / (3*(s + 5/3)) = 0.333 / (s + 1.666)
b) For 1st form divide both numerator and denominator by 1.2 and you get
H11(s) = 4.6833 / (2.833s + 1)
For the second form divide both numerator and denominator by 3.4 and you get
H12(s) = 1.618 / (s + 0.353)
c) For 1st form divide both numerator and denominator by c and you get
H11(s) = (a/c) / ((b/c)*s + 1)
For the second form divide both numerator and denominator by b and you get
H12(s) = (a/b) / (s + (c/b))