Average speed = Total distance ÷ Total time.<br><br>&bull; First leg: 30 km in 30 min = 0.5 h.<br>&bull; Second leg: 30 km in 2 h 15 min = 2.25 h.<br>&bull; Total distance = 30 + 30 = 60 km.<br>&bull; Total time = 0.5 + 2.25 = 2.75 h.<br>&bull; Average speed = 60 ÷ 2.75 &asymp; 21.82 km/h.<br><br>Final Answer: \(\approx\) 21.82 km/h