When you multiply two complex numbers given in polar form, the argument of the product is the sum of the arguments of the factors. Meanwhile, the modulus of the product is the product of the moduli of the factors.
In this case, you'd have

and the modulus would simply be

. Since

we would expect the final product to fall in the first quadrant.
take 23 2/3 and subtract 6 to get 53/3 or 17 2/3 or 17.667
then you take 17.667 and divide by 11 to get 1.606