Question 268978
Ozzy sleeps twice as long as kristen gets us
(i) Oz = 2Kr
sean sleeps 6 more hours than Kristen gets us
(ii) Se = Kr + 6
Sean and Ozzy sleep the same number of hours gets us
(iii) Se = Oz
substitute (iii) into (ii) to get
(iv) Oz = Kr + 6
substitute (i) into (iv) to get
 (v) 2Kr = Kr + 6
solving, we get
Kr = 6 hours
Now,
Oz = 12 hours and Se = 12 hours.
Since Kristen goes to be at 11, she must get up 6 hours later or at 5 AM