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?

In a school 2/3 of the students study a language of those who study a language 2/5 study french

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply