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A can run 45 m while B runs 50 m. In a km race B beats A by how many metres?

Correct Answer: 100 m

Explanation:

When B runs 50 m, then A runs 45 m.
When B runs 1000 m, then A runs (45/50) x 1000 m = 900 m
∴ B beats A by 100 m.


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