First you subtract 2 5/6 and 1 3/6 to get 1 2/6. 2/6 is equivalent to 1/4 so you can simplify to that which makes it 1 1/4. So the 1 stands for 1 hour and 1/4 of an hour is 15 min so the answer would be 1 hour and 15 min. Now subtract 6 hours by 1 hour and 15 min which is 4:85. But those kinds of clocks are used in the army so we'll fix it to a normal clock which it would be 5:25