Your mother-in-law is driving you to the grocery store in her tesla roadster at a steady speed of 190 km/hr (ignoring stop signs and traffic lights along the way). she travels for 2 km at this speed before spotting a police cruiser with a radar gun. at that point she quickly slows to 50 km/hr and drives the remaining 4 km to the grocery store at that speed. her average speed over the whole drive is closest to:
a. 70 km/hr
b. 80 km/hr
c. 90 km/hr
d. 100 km/hr
e. 110 km/hr
