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If X can run 48m and Y 42m, then in a race of 1km, X beats Y by:_________?

Correct answer: B. 125m

  • A. 140m
  • B. 125m
  • C. 100m
  • D. 110m

Explanation

Their speeds are in the ratio X:Y = 48:42 = 8:7. When X runs 1,000 m, Y runs 1,000 × 7/8 = 875 m, so X beats Y by 1,000 - 875 = 125 m. The likely wrong choice is 140 m, which comes from an incorrect conversion of the 48:42 ratio.

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