First find the total number of days in 6 weeks: 6 weeks * 7 days/week = <<6*7=42>>42 days
Then find the total difference in the number of pages Janet and Belinda read each day: 80 pages/day - 30 pages/day = <<80-30=50>>50 pages/day
Then multiply the daily difference by the number of days to find the total difference in the number of pages they read: 50 pages/day * 42 days = <<50*42=2100>>2100 pages
#### 2100