Physics, 09.10.2019 13:30 eternity88091

During the first 18 minutes of a 1.0-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 be if the car is to have an average speed of 21 m/s for the entire trip?

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During the first 18 minutes of a 1.0-hour trip, a car has an average speed of 11 m/s. what must the...