SOLUTION: Please could you help me with this word problem? My average speed for a journey was 50 mph. My return average speed was 70 mph. My average speed was NOT 60 mph. What was it?
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Question 551806: Please could you help me with this word problem? My average speed for a journey was 50 mph. My return average speed was 70 mph. My average speed was NOT 60 mph. What was it? Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website! Please could you help me with this word problem? My average speed for a journey was 50 mph. My return average speed was 70 mph. My average speed was NOT 60 mph. What was it?
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Avg speed for a round trip is
2*70*50/(70+50) = 7000/120 mi/hr
= 58.333... mi/hr
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It's less than 60 because more time is spent going 50 than going 70.
