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A person goes from point P to point Q co...

A person goes from point P to point Q covergin 1/3 of the distance with speed 10km/hr, the next 1/3 of the distance at 20 km/hr and the last 1/3 of the distance at 60 km/hr. The average speed of the person is

A

30 km/hr

B

24 km/hr

C

18 km/hr

D

12 km/hr

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The correct Answer is:
C
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