You drive 6.0 km at 50 km/h and then another 6.0 km at 90 km/h. Your average speed over the 12 km drive will be
a. less than 70 km/h.
b. equal to 70 km/h.
c. greater than 70 km/h.
d. exactly 38 km/h.
e. It cannot be determined from the information given because we must also know directions traveled.