1. The problem asks to convert a flow rate from millilitres per second to litres per hour. 2. We start with the given rate: 240 millilitres per second. 3. Convert millilitres to litres: since 1000 millilitres = 1 litre, we have $$240 \text{ ml/s} = \frac{240}{1000} \text{ litres/s} = 0.24 \text{ litres/s}$$ 4. Convert seconds to hours: there are 3600 seconds in 1 hour, so $$0.24 \text{ litres/s} \times 3600 \text{ s/hour} = 864 \text{ litres/hour}$$ 5. Therefore, the flow rate is 864 litres per hour.