1. A is a line perpendicular to BF, and it passes BF at point C, so AC is the shortest distance to BF. Because ∠AFB=30 degrees, AC=sin30*320= 160km.

The area affected by the typhoon is within 200 kilometers of the typhoon center, so city A will be affected by this typhoon.

2. Take ∠BAC as the vertex, make a circle with a radius of 200km, and there are two intersections with the straight line where the third side of the right triangle is located, with a distance of 240km.

So 240/40=6 hours.