A person travels from P to Q a speed of 80 km/hr and returns by increasing his speed by 10%. What is his average speed for both the trips? Options.
A) 33
B) 77
C) 48
D) 84
E) 21
Speed on return trip = 110% of 80 = 88 km/hr.   Average speed of trip = 80 + 88 /2 = 168/2= 
<gadget id="calculator">168/2</gadget>
<output>84</output>
84 km/hr   Answer : 84
<result>D</result>
A person travels from P to Q a speed of 80 km/hr and returns by increasing his speed by 10%. What is his average speed for both the trips?