SOLUTION: Heidi rides her bicycle 2 miles to school every day. On Monday it took her 7 minutes to ride to school and 8 minutes to ride home. What was her average speed? (Please help, this qu

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Question 837094: Heidi rides her bicycle 2 miles to school every day. On Monday it took her 7 minutes to ride to school and 8 minutes to ride home. What was her average speed? (Please help, this question is under the category rates. I tried some ways that do not make sense.)
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Average speed is always:
( total distance traveled ) / ( total time spent traveling )
Total distance = +2+%2B+2+=+4+ mi
Total time = +7+%2B+8+=+15+ min
-------------------
Ave speed = +4%2F15+ mi/min
To get mi/hr, do the conversion:
( mi/min ) x ( min/hr ) = mi/hr
+%284%2F15%29%2A%2860%2F1%29+=+16+ mi/hr