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?
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http://www.jiskha.com/search/index.cgi?query=+A+bicyclist+makes+a+trip+that+consists+of+three+parts%2C+each+in+the+same+direction+%28due+north%29+along+a+straight+road.+During+the+first+part%2C+she+rides+for+22+minutes+at+an+average+speed+of+6.80+m%2Fs.+During+the+second+part%2C+she+rides+for+36+minutes+at+an+average+speed+of+5.20+m%2Fs.+Finally%2C+during+the+third+part%2C+she+rides+for+8.0+minutes+at+an+average+speed+of+12.6+m%2Fs.+What+is+her+average+velocity+for+the+trip%3F+
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