Kristen has punch cards for her favorite tea house and her favorite coffee shop. She currently has 1 punch on the tea punch card and 4 punches on the coffee punch card. Given her regular routine, she consistently earns 3 new punches per week on the tea punch card and 2 on the coffee punch card. Before too long, Kristen will have the same number of punches on each card. How long will that take?
a) 4 weeks
b) 6 weeks
c) 8 weeks
d) 10 weeks