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A man completes 30 km of a journey at 6 ...

A man completes 30 km of a journey at 6 km/h and the remaining 40 km of the journey in 5 h. Find the average speed for the whole journery.

A

`6frac(4)(11) km//h`

B

`7 km//h`

C

`7frac(1)(2) km//h`

D

`8 km//h`

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