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You drive a car at a speed of 70 km//h i...

You drive a car at a speed of `70 km//h` in a straight road for 8.4 km, and then the car runs out of petrol. You walk for 30 min to reach a petrol pump at a distance of 2 km. The average velocity from the beginning of your drive till you reach the petrol pump is

A

`16.8 km//h`

B

`35 km//h`

C

`64 km//h`

D

`18.6 km//h`

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