1.

Smith travels along four sides of a square at speeds of 10, 12, 15 and 20 km/hr. The average speed of the Smith is:

A. \(13\frac{1}{3}\) km/hr
B. \(12\frac{1}{2}\) km/hr
C. \(14\frac{1}{4}\) km/hr
D. 10 km/hr
Answer» B. \(12\frac{1}{2}\) km/hr


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