For each pair of numbers, determine by what percent the second number is greater than the first. Also determine by what percent the first number is less than the second.
5 and 10

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.