Answer:
C. 58.18
Explanation:
The average speed means we will do miles per hour (mph). So if there are 640 miles for 11 hours the fraction would look like this:
640/11
We want to find the value for 1 hour so we need the bottom number(denominator) to be 1
Therefore we divide by 11 on the numerator and denominator by 11
58.181818(repeating)/1
This means we travel 58.181818... miles per hour.
If we round to the hundredths place we get 58.18 or option C.
Keep in mind that we can do this in ratio form and still get the same answer:
miles: hours
640:11
58.181818:1