Difference between revisions of "2003 AMC 10A Problems/Problem 4"
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Revision as of 19:02, 4 November 2006
Problem
It takes Mary minutes to walk uphill
km from her home to school, but it takes her only
minutes to walk from school to her home along the same route. What is her average speed, in km/hr, for the round trip?
Solution
Since she walked km to school and
km back home, her total distance is
km.
Since she spent minutes walking to school and
minutes walking back home, her total time is
minutes =
hours.
Therefore her average speed in km/hr is