The Saturday morning exodus out of the park comprised 4*2880 = <<4*2880=11520>>11520 elephants
This means that after the exodus, the park was left with 30000 - 11520 = <<30000-11520=18480>>18480 elephants
Since the final number of elephants was 28,980, the new elephants that entered were 28980 - 18480 = <<28980-18480=10500>>10500
The rate at which the new elephants entered the park was therefore 10500/7 = <<10500/7=1500>>1500 elephants/hour
#### 1500