In a 400 m race A beats B by 40 m, and in a 300 m race B beats C by 30 m. By how many metres will A beat C in a 400 m race?
Correct answer A. 76 m
Explanation
When A runs 400 m, B runs 360 m. B : C = 300 : 270, so C runs 360 × 0.9 = 324 m. A beats C by 76 m.
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