Obviously that bottle of red is stronger than you thought bottom rung!
Agreed, badly worded question. I assume he climbs 500ft on leaving A, which would give :
20mb difference = 600ft.
500ft aal at aerodrome A = 1000ft amsl
Low pressure to high pressure means he effectively descends so:
at B : 400ft amsl and 200ft above B.
If he just maintains 500ft on his altimeter at A, he theoretically doesn't get off the ground until the pressure begins to rise, in which case he would be 100ft below sea level and 300ft below B.
I wish I could blame the above on a bottle of wine but if I'm talking out of my ar$e it's all my own doing!
