Both Louis and Marcy work at jobs where they can collect overtime pay at a rate of 150% of their regular hourly wages for each hour they work beyond 40 hours in a week. Marcy's regular pay rate is $18 per hour, and Louis's regular pay rate is $16 per hour. Last week, Marcy worked for 48 hours and Louis made $64 more than Marcy. How many hours did Louis work last week?