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Stefan drove 558 in 9 hours. He then drove 120 miles in 3 hours. What was Stefan's average speed for the whole trip???

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PLEASE HELP! Im in 3rd grade!

total distance = 558+120 = 678 miles
total time = 9 + 3 = 12 hours

average speed = total distance/total time = 56.5 miles/hrs.

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