1. **State the problem:** We need to find the rate of flow of water in litres per second given that a water tap fills a 500 litres tank in 10 minutes. 2. **Formula used:** Rate of flow is calculated as \( \text{Rate} = \frac{\text{Volume}}{\text{Time}} \). 3. **Convert time to seconds:** Since 1 minute = 60 seconds, 10 minutes = \(10 \times 60 = 600\) seconds. 4. **Calculate the rate:** Using the formula, \( \text{Rate} = \frac{500 \text{ litres}}{600 \text{ seconds}} = \frac{5}{6} \text{ litres/second} \). 5. **Final answer:** The rate of flow of water is \( \frac{5}{6} \) litres per second, approximately 0.833 litres per second.