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Arithmetic Ability
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Q.
A person goes to his office at 1/3rd of the speed at which he returns from his office. If the average speed during the whole trip is 12 m /h . what is the speed of the person while he was going to his office?
A.
10
B.
6
C.
8
D.
can't be determined
View Answer
Correct choice: C
Explanation:
u = k , v= 3k ∴2uv/u+v ⇒2×k×3k/(k+3k)=12 => k = 8km/h
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