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A man walks at a speed of 6 km h^-1 for ...

A man walks at a speed of 6 km `h^-1` for 1 km and 8 km `h^-1` for the next 1 km.What is the average speed for the walk fo 2 km?

A

`7 km h^-1`

B

`16 km h^-1`

C

`12 km h^-1`

D

`6 km h^-1`.

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