There is no simpler ratio then 1:4. So the answer is 1:4.
The ODE is linear:
Multiplying both sides by gives
Notice that the left side can be condensed as the derivative of a product:
Integrating both sides with respect to yields
Since ,
so that
First we need to calculate how fast she was going in one hour:
116 / 5.8 = 20
then multiply that by 5 to get how far she will go in 5 hours
20 * 5 = 100
< = more than
> = less than
So therefore,
D > 5 miles
Hope this helped !