You have to make both 1/4 and 2/3 have the same denominator to be able to add for the total distance walked. Since 12 is their LCM they will now have a denominator of 12.1/4 then turn into 3/12 and 2/3 turns into 8/12. When you add 8/12 and 3/12 you should get 11/12
