1. **State the problem:** Calculate the average speed in km/h for a lap record on the Melbourne Formula 1 track, which is 5.303 km long, with a lap time of 1 minute and 24 seconds. 2. **Formula used:** Average speed is given by the formula: $$\text{Average speed} = \frac{\text{Total distance}}{\text{Total time}}$$ 3. **Convert time to hours:** 1 minute 24 seconds = 60 + 24 = 84 seconds. Convert seconds to hours: $$\frac{84}{3600} = 0.0233333\text{ hours}$$ 4. **Calculate average speed:** $$\text{Average speed} = \frac{5.303}{0.0233333}$$ 5. **Perform division:** $$\text{Average speed} = 227.457$$ 6. **Round to two decimal places:** $$227.46\text{ km/h}$$ **Final answer:** The average speed for the lap record is **227.46 km/h**.