GAUSS8 2005 Problem 10

Past Contests GAUSS8 2005
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1

Daniel rode his bicycle at a constant speed. After 40 minutes, he cycled 24\:km. How far did he cycle in 30 minutes?

Answer Choices
A. 12\:km
B. 14\;km
C. 16\:km
D. 18\:km
E. 20\;km