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 diving his car eastwards with speed ` 20 " km h "^(-1)`. Find the velocity of the bus w.r.t ground.

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The correct Answer is:

40 km/h
` 30^(@)` east of north.

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