Daniel rode his bicycle at a constant speed. After 40 minutes, he cycled 24 km. How far did he cycle in 30 minutes?
(A) 12 km (B) 14 km (C) 16 km (D) 18 km (E) 20 km
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Source: CEMC, University of Waterloo,
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Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.