A bus appears to move northwards at a sp...

A bus appears to move northwards at a speed of ` 20sqrt3 " km h"^(-1)` to a man driving his car eastwards with speed ` 20 " km h "^(-1)`. Find the velocity of the bus w.r.t ground.

`40 m s^-1, 30° N of E`

`40 m s^-1 45° E of N`

`40 m s^-1, 60° N of E`

`40 m s^-1. 30° W of N`

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