Answer:
Ken worked 4 hours overtime.
Explanation:
Ken earns $11 for an hour in his regular pay.
He receives time-and-a-half for overtime = $11 + (11/2) = 11 + 5.50 = $16.50
Ken worked 40 hours plus overtime and he made $66.00 in his overtime.
So he worked overtime = $66.00 ÷ 16.50 = 4 hours
Ken worked 4 hours overtime.