A person crosses a 600 m long street in 5 minutes. What is his speed in km/h ?

Options

A. `7 (1)/(5)`
B. `8 (1)/(5)`
C. `9 (1)/(5)`
D. 8

Answer

To find the speed of a person who crosses a 600 m long street in 5 minutes, we can follow these steps:

### Step-by-Step Solution

1. **Identify the given values**:
- Distance = 600 meters
- Time = 5 minutes

2. **Convert time from minutes to seconds**:
- Since speed is often calculated in meters per second (m/s) or kilometers per hour (km/h), we need to convert the time into seconds.
- \( 5 \text{ minutes} = 5 \times 60 = 300 \text{ seconds} \)

3. **Calculate speed in meters per second (m/s)**:
- Use the formula for speed:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]
- Plug in the values:
\[ \text{Speed} = \frac{600 \text{ meters}}{300 \text{ seconds}} = 2 \text{ m/s} \]

4. **Convert speed from meters per second to kilometers per hour**:
- To convert m/s to km/h, use the conversion factor:
\[ 1 \text{ m/s} = 3.6 \text{ km/h} \]
- Therefore:
\[ \text{Speed in km/h} = 2 \text{ m/s} \times 3.6 = 7.2 \text{ km/h} \]

5. **Final Answer**:
- The speed of the person is **7.2 km/h**.