1, the naughty boy walks the whole distance every hour 1/4, because after 2 hours, Shao Xiao walks from place A to place B, and after 2 hours, Shao Xiao walks out of place A, and the naughty boy reaches place B, and it takes 4 hours for him to walk the whole distance.

2. The simplest ratio is 5:2, because when we met and came back, Xiaoxiao walked for 7.5(2+2+2.5+ 1) hours, naughty came back 1 hour, and the naughty speed was 1/4, so we can see that Xiaoxiao walked 7.5 times faster.

3. The distance between the two places is 80km. Calculation formula: Judging from the answers of 1 and 2, Shao Xiao walked for 2 hours, while the naughty walked the whole journey. The distance between the two places is 64km, and the speed ratio is 5:2. Shao Xiao's speed is 64/ (speed difference) = 64/8 = 8km/h, and the total distance is 8*2+64=80.