Please someone help me with my math?!

Somone me i want to know what 18 hours out of 24 hours in a fraction

Ataxi company charges $2.25 for the first mile and then $0.20 per mile for each additional mile, or f = $2.25 + $0.20(m - 1) where f is the fare and m is the number of miles. if juan's taxi fare was $6.05, how many miles did he travel in the taxi? if juan's taxi fare was 7.65, how many miles did he travel in taxi

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827