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If Car A took n hours to travel 2 miles and Car B took m hours to travel 3 miles, which of the following expresses the time it would take Car C, traveling at the average (arithmetic mean) of those rates, to travel 5 miles?
A) (10nm)/(3n+2m)
B) (3n+2m)/10(n+m)
C) (2n+3m)/(5nm)
D) 10(n+m)/(2n+3m)
E) 5(n+m)/(2n+3m)
Answer: A
Source: Official Guide
A) (10nm)/(3n+2m)
B) (3n+2m)/10(n+m)
C) (2n+3m)/(5nm)
D) 10(n+m)/(2n+3m)
E) 5(n+m)/(2n+3m)
Answer: A
Source: Official Guide
