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Answer : 3 60 kmph Explanation : Answer: C) 60 kmph Explanation: Average speed = Total distance / Total time.Total distance traveled by Joel = Distance covered in the first 3 hours Distance covered in the next 5 hours.Distance covered in the first 3 hours = 3 x 60 = 180 milesDistance covered in the next 5 hours = 5 x 24 = 120 milesTherefore, total distance traveled = 180 120 = 300 miles.Total time taken = 3 5 = 8 hours.Average speed = 300/8 = 37.5 mph.we know that 1 mile = 1.6 kms=