question_answer

From my house 1 walked 5 km towards North. I turned right and walked 3 km. Again I went one km to the south. How far am I from my house?

A)  7 km               

B)  6 km

C)  4 km               

D)  5 km

Correct Answer: D

Solution :

[d]        Required distance \[AD=\sqrt{{{\left( AE \right)}^{2}}+{{\left( DE \right)}^{2}}}\] \[=\sqrt{{{\left( 4 \right)}^{2}}+{{\left( 3 \right)}^{2}}}\] \[=\sqrt{16+9}=\sqrt{25}=5\,km\]