A person travelled from his house to office at 15km/hr and office to house at 25km/hr. Then find the average speed?
Select:
A) 15km/hr
B) 20km/hr
C) 18.75km/hr
D) 24km/hr
E) 25km/hr
Average speed = (2*15*25)/(15+25)= 
<gadget id="calculator">(2*15*25)/(15+25)</gadget>
<output>75/4 = around 18.75</output>
18.75km/hr   Answer is 18.75km/hr
<result>C</result>
A person travelled from his house to office at 15km/hr and office to house at 25km/hr. Then find the average speed?