Velocity: 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. greater than 70 km/h.
B. equal to 70 km/h.
C. less 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.
Answer: C
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