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

distance travelled in 18 min is= 11880m total distance =75600m remaining distance= 75600-11880 = 63720m time = 42 min = 2520 sec speed = 63720/2520 = 25.28m/sec

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