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Question 43
Rohini walks 10 km north and turns right. She walks 10 km and then turns left. She walks 10 km and then turns right and walks 10 km more. How far (in km) is she from her starting point?
Solution
Let Rohini starts from point A and walks 10 km north to reach B and turns right and walks 10 km to reach C and then turns left to walk 10 km and finally turns right eastwards and walks 10 km more to stop at point E.
Thus, AE = $$\sqrt{(20)^2+(20)^2}$$
= $$\sqrt{400+400}=\sqrt{800}=20\sqrt2$$ km
=> Ans - (C)
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