To find the quotient of -18.42 and -1.2, we need to divide -18.42 by -1.2.
\[ \text{Quotient} = \frac{-18.42}{-1.2} = \frac{18.42}{1.2} \]
Calculating \( \frac{18.42}{1.2} \):
\[ 18.42 \div 1.2 = 15.35 \]
Since both numbers are negative, the result is positive.
Thus, the quotient is 15.35.