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Magnus drives from City A to City B at 100 mph. Reaching [#permalink]

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15 Jul 2003, 09:28

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Magnus drives from City A to City B at 100 mph. Reaching City B he recalls that he has forgot to take a vallet and start driving back at 120 mph. Reaching City A he takes his vallet in no time (his wife throws the vallet into his car), and drives to City B again at 140 mph. What is his average speed for the entire, three-leg trip?

Power on your mind—if I simply post the formula, you will not understand the problem again. The question is not so difficult to ask for help immediately. So, give it a try.