Question

A truck driver travels half the distance of his run at one velocity (v) and then completes his
run at one half his original velocity (\/2v). What was the trucker's average speed for the trip?
A. 0.85V
B. 0.80
C. 0.75v
D. 0.70v (E) 0.65v
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Answer 1

Answer:

Let the total distance be 2D

so to cover the first half driver would have taken time = Distance/speed= D/v

similarly time taken in second half=D/V2v

now average speed for the trip total travelled distance/total time taken= 2D/(D/v+D/V2v)=0.85V since there is only one option in term of V.

Hence choice A.0.85 V is the answer