A boy rode his bicycle northwards, then turned left and rode one km and again turned left and rode 2 km. He found himself exactly one km west of his starting point. How far did he ride northwards initially?
A
1 km
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B
2 km
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C
3 km
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D
5 km
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E
None of these
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Solution
The correct option is B 2 km Clearly, the boy rode from A to B, then to C and finally up to D. Since 2 km D lies to the west of A, so required distance =AB =CD =2 km.