A person goes to his office at 1/3rd of the speed at which he returns from his office. If the avg speed during the whole trip is 36m/h. what is the speed of the person while he was going to his office?  Choose the correct choice from the following options:
A) 8km/h B) 9km/h C) 10km/h D) 11km/h E) 24km/h
u = k , v= 3k   \inline \therefore \frac{2uv}{u+v}\: \: \Rightarrow \frac{2\times k\times 3k}{(k+3k)}=36   \inline \Rightarrow 1.5k = 36   \inline \Rightarrow k=24km/h   24km/h
<result>E</result>
A person goes to his office at 1/3rd of the speed at which he returns from his office. If the avg speed during the whole trip is 36m/h. what is the speed of the person while he was going to his office?