question_answer

Sanjeev walks 10 metres towards the South. Turning to the left, he walks 20 metres and then moves to his right. After moving a distance of 20 metres, he turns to the right and walks 20 metres. Finally, he turns to the right and moves a distance of 10 metres. How and in which direction is he from the starting point?

A) 10 metres North

B) 20 meter South

C) 20 metres North

D) 10 metres South

Correct Answer: B

Solution :

Explanation: The movements of Sanjeev from A to F are shown in figure. Clearly, Sanjeev?s distance from stating point \[A=AF=\left( AB+BF \right)\] \[=\text{ }AB+\left( BE-EF \right)=AB+\left( CD-EF \right)\] \[=\left[ 10+\left( 20-10 \right) \right]\text{ }m=\left( 10+10 \right)m=20\text{ }m\] Also, F lies to the South of A. So, Sanjeev is 20 metres to the south of his starting point.