a passenger in an airplane at an altitude of 10 kilometers sees two towns directly to the east. The angles of depression to the towns are 27

The answer is given by

10/tan(27) - 10/tan(28) = about .82 km

Here's an approximate diagram.....

Thanks and just for laughs.. what does a butcher weigh? meat.

Thanks for the smile anon.  

Great pic Chris    

Thanks, Melody.......