Find avrg speed if a man travels at speed of 24km/hr up and 36km/hr dawn at an altitude of 200m.
Select the correct option:
A) 25.8
B) 26.8
C) 27.8
D) 28.8
E) 29.8
avg speed=2*x*y/(x+y)   =2*24*36/(24+36)= 
<gadget id="calculator">2*24*36/(24+36)</gadget>
<output>144/5 = around 28.8</output>
28.8   ANSWER:28.8
<result>D</result>
Find avrg speed if a man travels at speed of 24km/hr up and 36km/hr dawn at an altitude of 200m.