A car covered the first 100 km at a speed of 50 km/h. It covered next 140 km at a speed of 70 km/h. What is its average speed?
A60 km/ h
B62 km/h
C58 km/h
D64 km/h
A60 km/ h
B62 km/h
C58 km/h
D64 km/h
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