Answer:
40 min
Step-by-step explanation:
his sister can do it twice as fast so the boy does 1 and the sister does 2. he will do 1/3 of the work and it will take 1/3 of the time
Instead of typing it all on here, I included my explanations with the work.
The means and medians are <em><u>not</u></em><em><u> </u></em> the same.