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Q 2803856748.     A car travels the first one-third distance at a speed of 10 km/h, the next one-third distance at 20 km/h and the last one-third distance at 60 km/h. Then, the average speed of the car is

A

30 km/h

B

24 krn/h

C

18 krn/h

D

None of these

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