Raju: start facing North and move 20 km; turn right and move 20 km; move 10 km in the North-East direction; turn right and move 20 km; turn right and move 20 km; finally turn left and move 20 km. Now, which direction is Raju facing?
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ASouth-East
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BNorth-East
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CSouth-West
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DNorth-West
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ENone of these
Answer
Correct Answer: North-West
Explanation
Introduction / Context:Unlike purely axial walks, this sequence includes diagonal motion (North-East) and several turns thereafter. We must track the facing after each turn, including from diagonal headings.
Given Data / Assumptions:
- Start facing North (20 km).
- Right → face East (20 km).
- Move 10 km North-East (heading NE).
- Right from NE → face SE (20 km).
- Right from SE → face SW (20 km).
- Left from SW → face NW (20 km).
Concept / Approach:For diagonal headings, a right turn rotates the facing 90° clockwise along the 8-wind compass (N, NE, E, SE, S, SW, W, NW). Apply each stated turn relative to the current diagonal or axial heading.
Step-by-Step Solution:North → (right) East.East → then move NE (heading becomes NE).NE → (right) SE.SE → (right) SW.SW → (left) NW.Final facing = North-West.
Verification / Alternative check:Plot the headings on an 8-point compass ring and advance one step per 90° turn in the specified direction; you land on NW.
Why Other Options Are Wrong:SE/NE/SW correspond to intermediate headings in the sequence, not the final orientation after the last left turn.
Common Pitfalls:Treating diagonal turns as if they were axial; ensure turns are relative to the current heading.
Final Answer:North-West