A man crosses a street 600m long in 5 minutes his speed in km per hour is

Options

A. 7.2
B. 3.6
C. 10
D. 8.4

Answer

To find the speed of the man in kilometers per hour, we will follow these steps:

### Step 1: Identify the distance and time
- Distance = 600 meters
- Time = 5 minutes

### Step 2: Convert time from minutes to seconds
Since speed is typically calculated in meters per second, we need to convert the time from minutes to seconds.
- 1 minute = 60 seconds
- Therefore, 5 minutes = 5 × 60 = 300 seconds

### Step 3: Calculate speed in meters per second
Speed is calculated using the formula:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]
Substituting the values we have:
\[ \text{Speed} = \frac{600 \text{ meters}}{300 \text{ seconds}} = 2 \text{ meters/second} \]

### Step 4: Convert speed from meters per second to kilometers per hour
To convert meters per second to kilometers per hour, we use the conversion factor \( \frac{18}{5} \):
\[ \text{Speed in km/h} = \text{Speed in m/s} \times \frac{18}{5} \]
Substituting the value we found:
\[ \text{Speed in km/h} = 2 \times \frac{18}{5} = \frac{36}{5} = 7.2 \text{ km/h} \]

### Conclusion
The speed of the man is **7.2 km/h**.