1. **Problem:** Which is faster, a car travelling at 55 km/h or a leopard running at 15 m/s? 2. **Step 1:** Convert the car's speed from km/h to m/s to compare both speeds in the same unit. $$\text{Speed in m/s} = \frac{\text{Speed in km/h} \times 1000}{3600}$$ 3. **Step 2:** Calculate the car's speed in m/s: $$\frac{55 \times 1000}{3600} = \frac{55000}{3600} = 15.28\overline{3} \text{ m/s}$$ 4. **Step 3:** Compare the speeds: - Car speed = $15.28\overline{3}$ m/s - Leopard speed = 15 m/s 5. **Step 4:** Since $15.28\overline{3} > 15$, the car is faster. **Final answer:** The car travelling at 55 km/h is faster than the leopard running at 15 m/s.