Julie drives 90 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 20 mph and half the distance at 70 mph . On her return trip, she drives half the time at 20 mph and half the time at 70 mph . Part B:

How long does the return trip take?
I would really appreciate a step by step to learn this portion. I dont think I quite grasp the idea of this part

One soccer player (a) is moving at 4 km/h when she kicks the ball while another soccer player (b) is moving at 8 km/h. what statement accurately compares their kinetic energy if they have the same mass? a) both soccer players have the same kinetic energy. b) player b has twice the kinetic energy of player a. c) player b has four times the kinetic energy of player a. d) their kinetic energy can't be compared without knowing their mass.