A person starts from a point, walks 10m straight. Turns left, walks 5m. Turns right, walks 8m. Turns left, walks 5m. If he is finally walking towards North, in which direction did he start?
Correct: B
Let's trace the path backwards from the final direction.
1. Final direction: North.
2. Before walking North for 5m, he took a Left turn. If he turned left to face North, he must have been walking East before the turn.
3. Before walking East for 8m, he took a Right turn. If he turned right to face East, he must have been walking North before the turn.
4. Before walking North for 5m, he took a Left turn. If he turned left to face North, he must have been walking East before the turn.
5. Before walking East for 10m (straight), he started from a point. So, he started walking East.
Let's verify by moving forward:
- Start: East
- 10m straight: walking East.
- Turns left: now walking North.
- Walks 5m: still walking North.
- Turns right: now walking East.
- Walks 8m: still walking East.
- Turns left: now walking North.
- Walks 5m: still walking North. (Final direction matches the given condition).
Therefore, he started walking East.