Math CentralQuandaries & Queries


Question from Justina:

Jack and Jill travel up a hill at a speed of 2mi/h.they travel back down the hill at a speed of 4mi/h.what is their average speed for the entire trip? express your answer as a mixed number

Hi Justina,

I think that you should first use the method I suggested to solve the similar problem we received from Flo. My answer was 3.75 mi/hr. Now let $d$ miles be the distance up your hill so that $d$ miles is also the distance down your hill and use the same method to solve your problem.

Write back if you need more assistance,


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