A person walks 100 m Westward, then turns left and walks 100 m. He then takes 225° turn clockwise. In which direction is he walking now?
- (a) South-West
- (b) South-East
- (c) North-West
- (d) North-East ✓ UPSC's answer
Why the answer is (d)
• The person starts by walking 100 m Westward, so his initial direction of travel is West.
• He turns left (90° counter-clockwise) from West, which changes his direction to South.
• He then walks 100 m South, maintaining the Southward direction.
• He takes a 225° turn clockwise from his current direction (South).
• A 225° clockwise turn from South is equivalent to a 135° counter-clockwise turn (360° - 225° = 135°).
• Turning 135° counter-clockwise from South leads to the North-East direction (90° to East + 45° towards North).
Why the other options are wrong
- (a) South-West
- South-West would result from a 135° clockwise turn from South, not 225°.
- (b) South-East
- South-East would result from a 45° clockwise turn from South, not 225°.
- (c) North-West
- North-West would result from a 225° counter-clockwise turn from South, not clockwise.
Asked in the CSAT Paper II of the UPSC Civil Services Preliminary Examination 2024, held on 16 June 2024. Question and answer key: Union Public Service Commission. Explanation: UPSC Answer Check.