After walking 6 km, Sonu turned right and covered a distance of 2 km, then turned left and covered a distance of 10 km. In the end, he was moving towards North. In which direction did he start his journey?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → North
The last direction is known, so the walk is traced backwards, undoing each turn: before a left turn he was facing 90° to the right of his new direction, and before a right turn 90° to the left.
Last 10 km: moving North
He turned left to face North, so before that turn he was moving East (the 2 km stretch)
He turned right to face East, so before that turn he was moving North (the first 6 km)
