Find avrg speed if a man travels at speed of 16km/hr up and 30km/hr dawn at an altitude of 200m.  Select the correct option:
A) 22.8 B) 21.8 C) 20.8 D) 28.8 E) 29.8
avg speed=2*x*y/(x+y)   =2*16*30/(16+30)=20.8   ANSWER:20.8
<result>C</result>
Find avrg speed if a man travels at speed of 16km/hr up and 30km/hr dawn at an altitude of 200m.