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Susie has planned a trip to a city 60 miles away. She wishes to have an...

Susie has planned a trip to a city 60 miles away. She wishes to have an average speed of 60 mph for the trip. Due to a traffic jam, however, she only averaged 30 mph for the first 30 miles. How fast does she need to go for the remaining 30 miles so that her average speed is 60 mph for the whole trip?

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