Question
The graph shows the time a car took to travel a distance of 700 km at \( 100 \mathrm{~km} / \mathrm{h} \). Use the graph to: 5.1 determine the distance that the car will cover in \( 2 \frac{1}{2} \) hour . 5.2 determine how long it will take to cover 480 km .
Ask by Hardy Daniel. in South Africa
Jan 23,2025
Real Tutor Solution
Tutor-Verified Answer
Answer
**5.1** The car will cover **250 kilometers** in \( 2 \frac{1}{2} \) hours.
**5.2** It will take **4.8 hours** (4 hours and 48 minutes) to cover **480 kilometers**.
Solution
To solve these problems, we'll use the basic formula that relates distance, speed, and time:
\[
\text{Distance} = \text{Speed} \times \text{Time}
\]
\[
\text{Time} = \frac{\text{Distance}}{\text{Speed}}
\]
Given:
- **Speed (\( v \))**: \( 100 \, \text{km/h} \)
- **Total Distance**: \( 700 \, \text{km} \) (This information confirms the speed but isn't directly needed for these specific questions.)
### 5.1 Determine the distance that the car will cover in \( 2 \frac{1}{2} \) hours.
**Step 1:** Convert \( 2 \frac{1}{2} \) hours to a decimal for easier calculation.
\[
2 \frac{1}{2} \, \text{hours} = 2 + 0.5 = 2.5 \, \text{hours}
\]
**Step 2:** Use the distance formula.
\[
\text{Distance} = \text{Speed} \times \text{Time}
\]
\[
\text{Distance} = 100 \, \text{km/h} \times 2.5 \, \text{h} = 250 \, \text{km}
\]
**Answer:** The car will cover **250 kilometers** in \( 2 \frac{1}{2} \) hours.
---
### 5.2 Determine how long it will take to cover 480 km.
**Step 1:** Use the time formula.
\[
\text{Time} = \frac{\text{Distance}}{\text{Speed}}
\]
\[
\text{Time} = \frac{480 \, \text{km}}{100 \, \text{km/h}} = 4.8 \, \text{hours}
\]
**Step 2 (Optional):** Convert 4.8 hours to hours and minutes for a clearer understanding.
\[
0.8 \, \text{hours} \times 60 \, \text{minutes/hour} = 48 \, \text{minutes}
\]
\[
4.8 \, \text{hours} = 4 \, \text{hours} \, 48 \, \text{minutes}
\]
**Answer:** It will take **4.8 hours** (which is 4 hours and 48 minutes) to cover **480 kilometers**.
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Bonus Knowledge
To determine how far the car travels in \( 2 \frac{1}{2} \) hours, simply multiply the speed by the time. At \( 100 \mathrm{~km/h} \), the calculation is \( 100 \times 2.5 = 250 \) km. So, in two and a half hours, the car covers 250 km. For the second question, to find out how long it takes to cover 480 km, divide the distance by the speed: \( 480 \div 100 = 4.8 \) hours. Therefore, the car will take 4.8 hours to travel 480 km.