A person travelled from his house to office at 45km/hr and office to house at 55km/hr. Then find the average speed?  Options.
A) 49km/hr  B) 49.5km/hr  C) 50km/hr  D) 50.5km/hr  E) 51km/hr
Average speed = (2*45*55)/(45+55)= 
<gadget id="calculator">(2*45*55)/(45+55)</gadget>
<output>99/2 = around 49.5</output>
49.5km/hr
Answer is 49.5km/hr
<result>B</result>
A person travelled from his house to office at 45km/hr and office to house at 55km/hr. Then find the average speed?