Multiple choice A bus covers a distance of 648 km in 720 minutes. What is the average speed of the bus? $42 km/hr$ $46 km/hr$ $54 km/hr$ Cannot be determined None of these Reveal answer Fill a bubble to check yourself C Correct answer Explanation Distance = 648 km, Time = 720 minutes = 12 hours. Speed = Distance/Time = 648/12 = 54 km/hr. Option C is correct.