A man walks east with certain velocity . A car is travelling along a road which is `30^(@)` West of north . While a bus is travelling another road which is `60^(@)` South of West . Find the angle between velocity vector of
(a)man and car
(b)car and bus
(c)bus and man.

Explanation

Form the diagram the angle between velocity vector of man and car is `90^(@)+30^(@)=120^(@)`
The angle between velocity vector of car and bus is `60^(@)+60^(@)=120^(@)`
The angle between velodcity vector of bus and man is `30^(@)+90^(@)=120^(@)`