One minute and two minute passes
Two minutes
Two minutes return trip
Two minutes
5 minutes 10 minutes.
10 minutes
Return in one minute
1 min
One minute, two minutes later.
Two minutes
2+2+ 10+ 1+2= 17
2.
Because the people in the room don't match the brand.
So there are always two versions.
Father and son 0+
Mother and daughter 00
Couple++version
Father and son++
Mother and daughter 0+
Lovers 00
Just knock on the door of 0+
Determine whether the little boy speaks or the little girl speaks, and you can all determine the median.
arithmetic mean
geometric mean
If you are satisfied, please accept it. Thank you.