Answer:
a). 14 hours a week
b). 10.5 hours a week
Explanation:
His time = 42 hours a week
Quarter of his time = one fourth of his time.
Third of his time = one third of his time
So, for dealing with complaints:
42h * 1/3 = 42h / 3 = 14h
On the phone:
42h * 1/4 = 42h / 4 = 10.5h