# Step-by-Step Solution **Given:** A centrifugal pump delivers \(18 \, \text{m}^3/\text{h}\) of water. Find the flow rate in **L/s (liters per second)**. --- ## **Step 1: Convert cubic meters per hour to liters per hour** - \(1 \, \text{m}^3 = 100 \, \text{L}\) So, \[ 18 \, \text{m}^3/\text{h} = 18 \times 100 = 18000 \, \text{L/h} \] --- ## **Step 2: Convert liters per hour to liters per second** - \(1 \, \text{hour} = 360 \, \text{seconds}\) So, \[ 18000 \, \text{L/h} \div 360 \, \text{s/h} = 5 \, \text{L/s} \] --- ## **Step 3: Final Answer** **The flow rate is \(5 \, \text{L/s}\).** --- ### **Answer:** \[ \boxed{5 \text{ L/s}} \] (Correct option is **B**)