If Alice walks 4 miles in 50 minutes, then Alice will walk how far in 80 minutes if she walks at the same speed the whole time? If necessary, round your answer to the nearest tenth of a mile.

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.