A person travels from P to Q a speed of 50 km/hr and returns by increasing his speed by 50%. What is his average speed for both the trips?
Choose the correct option:  A) 62.5  B) 77  C) 48  D) 99  E) 21

Rationale: "speed on return trip = 150 % of 50 = 75 km / hr . average speed of trip = 50 + 75 / 2 = 125 / 2 = 62.5 km / hr answer : a"
Answer: A