posted by Anonymous .
A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 22 minutes at an average speed of 6.80 m/s. During the second part, she rides for 36 minutes at an average speed of 5.20 m/s. Finally, during the third part, she rides for 8.0 minutes at an average speed of 12.6 m/s. What is her average velocity for the trip?