What must be true for lines a and b to be parallel lines? Select four options. m1 = m2 = 58 x = 20 = 1 = 58 = 58 x = 19 + + m2 = 180

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?