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A woman drives a car from one city to another with different constant speeds along the...

A woman drives a car from one city to another with different constant speeds along the trip. She drives at a speed of 30 km/h for 20.0 min, 53 km/h for 15.0 min, makes a stop for 38 min, then continues at 39 km/h for 35 min, at which point she reaches her destination.

What is her average velocity for the entire trip, in km/hr?
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