A man travels a distance of 24 km at 6 k...

A man travels a distance of 24 km at 6 km/ h another distance of 24 km at 8 km/h and a third distance of 24 km at 12 km/h. His average speed for the whole journey (in km/h) is

A

(A) `8frac(2)(3)`

B

(B) 8

C

(C) `2frac(10)(13)`

D

(D) 9

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