A pump lifts 72,000 litres of water per hour against a total head of 19 meters. Compute the water horse power.
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To quickly calculate metric Water Horsepower during an exam, use this simple formula:
\[ \text{WHP} = \frac{Q \text{ (L/s)} \times H \text{ (m)}}{75} \]
For this problem: \(\frac{20 \times 19}{75} = \frac{380}{75} \approx 5.07 \text{ hp}\).