A car travels from A to B at a speed of ...

A car travels from A to B at a speed of `20 km//hr` and returns at a speed of `30 km//hr`. The average speed of the car for the whole journey is

` 5 km h^(-1)`

`24 km//h^(-1)`

`25 km h^(-1)`

`50 km h^(-1)`

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