Question

A vehicle was scheduled to complete a 360 km journey in 6 hours. For the initial 4 hours, it maintained a steady speed of 56 km/h. At what minimum speed must the vehicle travel for the remaining distance to ensure it arrives on schedule?

A 80 km/h
B 64 km/h
C 66 km/h
D 72 km/h
E 68 km/h
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