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Part ACSIR NET September 2022head-start-not-full-course

Head start not full course

On a track of 200 m length, S runs from the starting point and R starts 20 m ahead of S at the same time. Both reach the end of the track at the same time. S runs at a uniform speed of 10 m/s. If R also runs at a uniform speed, then how much more time would R take to run the entire course?

  1. A.0.5 second
  2. B.1.0 second
  3. C.1.5 second
  4. D.2.2 seconds✓ Correct

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, and why this one tests execution slip.

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The trap it tests

Execution slip

The idea was right. The computation was not.

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