Kunal walks 10 km towards north. From there, he walks 6 km towards South. Then he walks 3 km towards east. How far and in which direction is he with reference to his starting point?

Answer: Option B

From the figure, we get OC which is the required distance,
OC = √(OC² + BC²)
OC = √(4² + 3²)
Oc = 5 km (North-East)