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 6m/h. what is the speedof the person while he was going to his office? Choose the correct choice from the following
A) 4km/h	B) 9km/h	C) 10km/h	D) 11km/h	E) 13km/h
u = k , v= 3k   {2uv}{u+v}/2uv   \frac{2\times k\times 3k}{(k+3k)}=6   1.5k = 6   k=4km/h   4km/h
<result>A</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 6m/h. what is the speedof the person while he was going to his office?