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What was the average speed of a car that traveled 45 km in 30 minutes?

The average speed of the car can be calculated using the formula:

```

Average speed = Distance traveled / Time taken

```

Substituting the given values:

```

Average speed = 45 km / 0.5 hours

```

Simplifying the expression:

```

Average speed = 90 km/h

```

Therefore, the average speed of the car was 90 km/h.