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You drove to School at 30 mph, and came back at 40 mph. What was the average speed for the round trip?



You drove to School at 30 mph, and came back at 80 mph. What was the average speed for the round trip?



You drove to School at 50 mph, and came back at 80 mph. What was the average speed for the round trip?



You drove to School at 70 mph, and came back at 130 mph. What was the average speed for the round trip?



You drove to School at 70 mph, and came back at 90 mph. What was the average speed for the round trip?

You drove to School at 50 mph, and came back at 60 mph. What was the average speed for the round trip?



You drove to School at 30 mph, and came back at 70 mph. What was the average speed for the round trip?



시속 60 km 로 학교에 갔다가, 시속 90 km 로 돌아 왔다. 왕복 총 평균 속도는?



You drove to School at 70 mph, and came back at 120 mph. What was the average speed for the round trip?



You drove to School at 60 mph, and came back at 80 mph. What was the average speed for the round trip?

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213    34.3 43.6 61.5 91 78.8 ( 309.2 )   54.5 42 72 88.4 68.6 ( 325.5 )   [[ 634.7 ]]