Multiple choice Rakesh covers x km at 10 km/hr and 2x km at 20 km/hr. What is his average speed? 12 km/hr 15 km/hr 16 km/hr 18 km/hr Data insufficient Reveal answer Fill a bubble to check yourself B Correct answer Explanation Average speed = Total distance / Total time. Total distance = x + 2x = 3x. Total time = (x/10) + (2x/20) = x/10 + x/10 = 2x/10 = x/5. Average speed = 3x / (x/5) = 15 km/hr.