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A can run a kilometer race in 4 1/2 min while B can run same race in 5 min. How many meters start can A give B in a kilometer race, so that the race mat end in a dead heat?

Correct answer: D. 100 m

  • A. 150 m
  • B. 125 m
  • C. 130 m
  • D. 100 m

Explanation

A's speed is 1,000 m ÷ 4.5 min, while B's speed is 1,000 m ÷ 5 min. In 4.5 minutes, B covers (1,000 ÷ 5) × 4.5 = 900 m, so A can give B 1,000 - 900 = 100 m. The likely wrong answer is 150 m, usually caused by treating the time difference as a direct distance difference.

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About Time, Speed and Distance

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