A person travels from P to Q at a speed of 40 km/hr and returns by increasing his speed by 50%.
What is his average speed for both the trips ?
Pick
A) 44 km/hour  B) 46 km/hour  C) 48 km/hour  D) 50 km/hour  E) None of these
Explanation:   Speed while going = 40 km/hr   Speed while returning = 150% of 40 = 60 km/hr   Average speed =   2xyx+y=2   ∗   40   ∗   6040+60=4800100=48Km/hr   Answer: 48 km/hour
<result>C</result>
A person travels from P to Q at a speed of 40 km/hr and returns by increasing his speed by 50%.
What is his average speed for both the trips ?