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During the first 18 minutes of a 1 hour trip a car has an

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During the first 18 minutes of a 1 hour trip, a car has an average speed of 11 m/s. What must the average speed of the car be during the last 42 minutes of the trip to be if the car is to have an average of 21 m/s for the entire trip?

Reference no: EM13625983

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