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Question

A boy rides rode his bicycle northwest, then turned left and rode one km and again turned left and rode 2 kms. He found himself exactly one km west of his starting point. How far did he ride northwards initially?
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Solution

Starting point is A. The boy rode from A to B, the to C and finally upto D. Since D lies to the west of A and so the distance AB =CD=2kms.

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