(i) Distance `= AB+BC+CD`
`=(500+400+200)=1100 m`
(ii) Displacement `=AD=sqrt((AB-CD)^(2)+BC^(2))`
`=sqrt((500-200)^(2)+(400)^(2))`
`=500 m`
(iii) Average speed `=("Total distance")/("Total time")`
`=(110)/(20)=55` m/min
(iv) Average velocity `=(AD)/(t)=(500)/(200)=25` m/min (alpng AD)