A Car's Initial Velocity Is 50

Multiple Choice

A car's initial velocity is 50.0 km/h in the direction 60.0° north of east,and its final velocity is 70.0 km/h in the direction 40.0° south of east.If the time period for this journey is 30.0 minutes,what is the magnitude of the car's average acceleration?​

A) 186​ km/h/h
B) ​240 km/h/h
C) ​92.8 km/h/h
D) ​3.94 km/h/h