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A car travels the first one-third of a c...

A car travels the first one-third of a certain distance with a speed of 10 km/hr, the next one-third distance with speed of 20 km/hr and the last one-third distance with a speed of 60 km/hr. The average speed of the car for the whole journey is

A

18 km/hr

B

24 km/hr

C

30 km/hr

D

36 km/hr

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