A body covers 1/3rd part of total distan...

A body covers `1/3`rd part of total distance with 10 km `h^(-1)` , the second `1/3`rd with 20 km `h^(-1)` and the rest rd with 60 km `h^(-1)` . What is the average speed ?

18 km`h^(-1)`

22.5 km`h^(-1)`

45km`h^(-1)`

36 km`h^(-1)`

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