A body moves with a uniform speed of 10 km `h^(-1)` for 2 h. The average speed of the body is ______ km `h^(-1)`.

Options

A. 10
B. 20
C. 5
D. 25

Explanation

To solve the problem, we need to find the average speed of a body that moves with a uniform speed of 10 km/h for 2 hours.

### Step-by-Step Solution:

1. **Identify the given values:**
- Uniform speed (u) = 10 km/h
- Time (t) = 2 hours

2. **Calculate the total distance traveled:**
- The formula for distance (d) is:
\[ d = \text{speed} \times \text{time} \]
- Substituting the values:
\[ d = 10 \, \text{km/h} \times 2 \, \text{h} = 20 \, \text{km} \]

3. **Calculate the average speed:**
- The formula for average speed (v_avg) is:
\[ v_{\text{avg}} = \frac{\text{total distance}}{\text{total time}} \]
- Here, total distance = 20 km and total time = 2 hours.
- Substituting the values:
\[ v_{\text{avg}} = \frac{20 \, \text{km}}{2 \, \text{h}} = 10 \, \text{km/h} \]

4. **Conclusion:**
- The average speed of the body is **10 km/h**.