Subjects physics

Khufra Speed D888A6

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Khufra Speed D888A6


1. **State the problem:** Khufra travels two segments: from his house to the park (9 km in 45 minutes) and from the park to his cousin's house (6 km in 30 minutes). We need to find his speed for each segment and for the entire trip. 2. **Formula for speed:** Speed is calculated as distance divided by time. $$\text{Speed} = \frac{\text{Distance}}{\text{Time}}$$ Important: Convert time to hours since speed is usually in km/h. 3. **Calculate speed from house to park:** - Distance = 9 km - Time = 45 minutes = $\frac{45}{60} = 0.75$ hours $$\text{Speed}_1 = \frac{9}{0.75} = 12 \text{ km/h}$$ 4. **Calculate speed from park to cousin's house:** - Distance = 6 km - Time = 30 minutes = $\frac{30}{60} = 0.5$ hours $$\text{Speed}_2 = \frac{6}{0.5} = 12 \text{ km/h}$$ 5. **Calculate speed for the entire trip:** - Total distance = 9 km + 6 km = 15 km - Total time = 45 min + 30 min = 75 min = $\frac{75}{60} = 1.25$ hours $$\text{Speed}_{total} = \frac{15}{1.25} = 12 \text{ km/h}$$ **Final answers:** - Speed from house to park: 12 km/h - Speed from park to cousin's house: 12 km/h - Speed for entire trip: 12 km/h