A car A is moving with speed "40 km h"^(...

A car A is moving with speed `"40 km h"^(-1)` along a straight line `30^(@)` north of east and another car B is moving with same speed along a straight line `30^(@)` south of east. The relative velocity of car A as observed from the car B is

`"40 km h"^(-1)" north - east"`

`"40 km h"^(-1)" south"`

`"40 km h"^(-1)" north"`

`"40 km h"^(-1)" south - east"`

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