Discussion
Starting from a point P, Sachin walked 20 metres towards South. He turned left and walked 30 metres. He then turned left and walked 20 metres. He again turned left and walked 40 metres and reached a point Q. How far and in which direction is the point Q from the point P ?
Answer: B
Correct answer: 10 metres, West
The southward and northward legs cancel - 20 south and then 20 north - while the sideways moves are 30 east and 40 west. Q therefore lies \[ 40 - 30 = \mathbf{10}\text{ metres west} \] of P.
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