I really don't understand this helppp

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

What are the digits that repeat in the smallest sequence of repeating digits in the decimal equivalent of 24/11?