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Part ACSIR NET June 2024proportional-distance-same-time

Proportional distance same time

An athlete running on a track falls short of the finish line by 10 m when she runs at a constant speed for a given time. If she increases her speed by 20%, she overshoots by 20 m in the same time. What is the length of the track?

  1. A.134 m
  2. B.156 m
  3. C.160 m✓
  4. D.164 m

You have the answer. Trap Analysis is why the other three were written.

Not a worked solution repeated four times — the specific reasoning error each wrong option was built to reward.

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