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, 2005

Algebra Difficulty 2.0 Junior Find the answer Canada

Jack went running last Saturday morning. He ran the first 12 km at 12 km/h and the second 12 km at 6 km/h. Jill ran the same route at a constant speed, and took the same length of time as Jack. Jill's speed in km/h was

(A) $8$ (B) $9$ (C) $6$ (D) $12$ (E) $24$

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.