2003 AMC 12A Problem 4
Problem 4 of 25EasierProbability & StatisticsArithmetic
It takes Mary minutes to walk uphill km from her home to school, but it takes her only minutes to walk from school to home along the same route. What is her average speed, in km/hr, for the round trip?
Answer choices
Show solution
Solution
Mary walks a total of km in minutes, which is hour.
Her average speed is km/hr.
Thus, the correct answer is A.
Tagged: distance rate and time · unit conversion · harmonic mean