Cathy lives in a state where speeders are fined $12 for each mile per hour over the speed limit. Cathy was given a ticket for $84 for speeding on a road where the speed limit is 45 miles per hour. How fast was Cathy driving?

Answer: 52 miles per hour

Step-by-step explanation:

From the above question speeders are fined $12 for each mile per hour.

Cathy was fined $84 on a road where the speed limit is 45 miles per hour.

If the fine charges per mile per hour is $12. The to find the no of miles per hour Cathy was over with is

$84/$12 = 7

Therefore 45 miles per hour plus 7 miles per hour is 52 miles per hour.