If someone knows the answer that will be greatly appreciated :)

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?

What is the celsius temperature that is equal to 94 degrees fahrenheit using the formula f=9/5 c+32

Look at attachment. has all info needed. need