Question

A car travels at a uniform speed of 45 km/h for 210 km and then travels for 420 km at a uniform speed of 70 km/h. What is the average speed of the car during the entire journey?

A 63(1/16) km/h
B 59(5/16) km/h
C 63(5/16) km/h
D 59(1/16) km/h
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