Hello dear StackExchange community, I have an exam next week, and I need to get a real high mark to pass. Therefore I'm looking for some hard questions to solve, and this is one.
[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/Ip6SY.png

Well I don't expect a full solution from you here, but some guidance would be nice.
1) What does "assuming *B* of BJT's are very high" mean?
2) How do we seperate the 1 mA source to the differential pair? Because the solution guide here: http://www.chegg.com/homework-help/microelectronic-circuits-6th-edition-chapter-10-problem-11e-solution-9780195323030

says that it is evenly distributed. How?