Haley and Sabrina are both training for a race. Haley runs 4.2 miles each day. Sabrina has been running 2/3 as many miles each day as Haley. Next week, Sabrina is going to increase the miles she runs each day by 25%. Haley and Sabrina both train by running 6 days each week. What is the total number of miles Sabrina will run next week to train for the race?