Hi Nick,

Sorry, don't know what is the #2. Here are all my tests (all 2D, all with plane speed == 1. However, covered main different cases):

-3 0 0
4 2 0
1
res: 4.4220072


-3 0 0
6 4 0
1
res: 5.4139598


0 -3 0
4 6 0
1
res: 5.4139598


0 -3 0
4 0 0
1
res: 2.5949700


-3 0 0
4 0 0
1
res: 4.9511633


3 0 0
4 0 0
1
res: 1.0000000

Edited by author 13.08.2014 06:15

Problem will be unlocked in 5 minutes. Sorry.