If r is directly proportional to x and if s = 2/3 when r equal 4/5 what is the value of r when s equal 4/9 a) 8/15 b) 1/15 c) 2/15 d) 7/15

Kelli swam upstream for some distance in a hour.she then swam downstream the same river for the same distance in only 6 minutes.if the river flows at 5km/hr, how fast can kelli swim in still water?