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I drive at an average speed of 30 miles per hour to the railroad station each morning and catch my train. On..........

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I drive at an average speed of 30 miles per hour to the railroad station each morning and catch my train. On a particular morning, there was a lot of traffic and at the halfway point, I had averaged only 15 miles per hour.
How fast must I drive for the rest of the way to catch my train?

posted Apr 9 by Balwinder

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