A man walks 10 m in front and then 10 m to the right. Then every time returning to his left, he walks 5, 15 and 15 m, respectively. How far is he now from his starting point ?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 5 m
Taking the direction he first walks (his front) as North, track the way he faces after every turn; a left turn moves the facing one quarter anticlockwise.
10 m in front: North.
10 m to the right: facing East.
Turns left, 5 m: facing North.
Turns left, 15 m: facing West.
Turns left, 15 m: facing South.
The two northward walks (10 m and 5 m) are cancelled by the 15 m South, so he is back on the starting line. East 10 m and West 15 m leave him 5 m West of the start.
