A person travels from P to Q a speed of 30 km/hr and returns by increasing his speed by 30%. What is his average speed for both the trips? Choose the correct choice:
A) 33  B) 77  C) 48  D) 99  E) 34.5

Rationale: "speed on return trip = 130 % of 30 = 39 km / hr . average speed of trip = 30 + 39 / 2 = 69 / 2 = 34.5 km / hr answer : e"
Answer: E