Mitch and Jane met at the mall today. Mitch goes to the mall every 3 days and jane goes to the mall every 5 days. How many times will they meet again in the next 3 weeks?

Is it 3 or 4 think it 3

Mitch goes on days:

1, 4, 7, 10, 13, 16, 19

Jane goes on days:
1, 6, 11, 16, 21