Answer:
The bat flies faster by 7 feet
Explanation:
first, you need to find some common ground. 84 and 4 can both be divided by two 84/2=42 so now we know that:
-The bat flies 42 feet in two seconds
-The dove flies 35 feet in two seconds
So we know that the bad flies faster because the number is greater, but by how much?
To find this just subtract 35 from 42 to get 7.
So to summarize
The bat flies faster by 7 feet