Multiple choice general knowledge

Ram travels 7 km to the north. Then he turns to the right and walks 3 km. Now, he turns to the right and walks 7km. How many kilometres is he away from the starting point in straight?

  1. 3km

  2. 7km

  3. 10km

  4. 14km
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A Correct answer
Explanation

Starting from the origin, Ram moves 7 km north to point (0, 7). Turning right means facing east, so he walks 3 km east to point (3, 7). Turning right again means facing south, so he walks 7 km south to point (3, 0). The straight-line distance from the origin (0, 0) to (3, 0) is sqrt(3^2 + 0^2) = 3 km.

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