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In a 100 m race, A can beat B by 25 m and B can beat C by 4 m. In the same race, A can beat C by:________?

Correct answer: C. 28 m

  • A. 21 m
  • B. 26 m
  • C. 28 m
  • D. 29 m

Explanation

A beats B by 25 m in a 100 m race, so A:B speed = 100:75 = 4:3. B beats C by 4 m, so B:C = 100:96 = 25:24; therefore A:C = 25:18, and when A runs 100 m, C runs 72 m, making the lead 28 m. A student may choose 21 m by subtracting 25 m and 4 m directly, although the comparisons are sequential ratios.

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