A person travelled from his house to office at 36km/hr and office to house at 12km/hr. Then find the average speed?	Choose the correct choice: A) 15km/hr B) 20km/hr C) 32km/hr D) 24km/hr E) 18km/hr
Average speed = (2*36*12)/(36+12)= 
<gadget id="calculator">(2*36*12)/(36+12)</gadget>
<output>18</output>
18km/hr   Answer is 18km/hr
<result>E</result>
A person travelled from his house to office at 36km/hr and office to house at 12km/hr. Then find the average speed?