A person traveled from P to Q at a speed of 40km/hr and return by increasing his speed by 50km/hr. What is his average speed for both the trips?  Choose the correct choice from the following:
A) 30km/hr B) 50km/hr C) 55km/hr D) 48km/hr E) 60km/hr
Speed on return trip = 150% of 40 = 60kmph   Average = 2*40*60/(40+60) = 4800/100= 
<gadget id="calculator">4800/100</gadget>
<output>48</output>
48km/hr   Answer is 48km/hr
<result>D</result>
A person traveled from P to Q at a speed of 40km/hr and return by increasing his speed by 50km/hr. What is his average speed for both the trips?