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, 2001

Algebra Difficulty 3.0 AMC 10/12 Find the answer Canada

Cindy leaves school at the same time every day. If she cycles at 20 km/h, she arrives home at 4:30 in the afternoon. If she cycles at 10 km/h, she arrives home at 5:15 in the afternoon. At what speed, in km/h, must she cycle to arrive home at 5:00 in the afternoon?

(A) $16\frac{2}{3}$ (B) $15$ (C) $13\frac{1}{3}$ (D) $12$ (E) $18\frac{3}{4}$

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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.