1. **Problem 1:** A person walks 15 km in 2 hours 30 minutes. Calculate average speed in m/s and km/hr. 2. **Formula:** Average speed $v = \frac{d}{t}$ where $d$ is distance and $t$ is time. 3. **Convert time:** 2 hours 30 minutes = 2.5 hours. 4. **Calculate speed in km/hr:** $$v = \frac{15\text{ km}}{2.5\text{ hr}} = 6.0\text{ km/hr}$$ 5. **Convert km/hr to m/s:** $$6.0\text{ km/hr} \div 3.6 = 1.666\ldots \approx 1.7\text{ m/s}$$ 6. **Problem 2:** A car travels 15 km in 45 minutes. Calculate average speed. 7. **Convert time:** 45 minutes = 0.75 hours. 8. **Calculate speed in km/hr:** $$v = \frac{15\text{ km}}{0.75\text{ hr}} = 20\text{ km/hr}$$ 9. **Convert km/hr to m/s:** $$20\text{ km/hr} \div 3.6 = 5.555\ldots \approx 5.6\text{ m/s}$$ **Final answers:** - Person's speed: 6.0 km/hr or 1.7 m/s - Car's speed: 20 km/hr or 5.6 m/s Your calculations and unit conversions are correct.