An athelete runs 400meters race in 24 seconds. His speed (in km/hr) is

Options

A. A. 50
B. B. 60
C. C. 40
D. D. 10

Answer

To find the speed of the athlete in kilometers per hour (km/hr), we can follow these steps:

### Step 1: Convert the distance from meters to kilometers.
The distance given is 400 meters. To convert meters to kilometers, we use the conversion factor where 1 kilometer = 1000 meters.

\[ \text{Distance in kilometers} = \frac{400 \text{ meters}}{1000} = 0.4 \text{ kilometers} \]

### Step 2: Convert the time from seconds to hours.
The time given is 24 seconds. To convert seconds to hours, we use the conversion factor where 1 hour = 3600 seconds.

\[ \text{Time in hours} = \frac{24 \text{ seconds}}{3600} = \frac{24}{3600} = \frac{1}{150} \text{ hours} \]

### Step 3: Use the formula for speed.
The formula for speed is given by:

\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]

Substituting the values we calculated:

\[ \text{Speed} = \frac{0.4 \text{ kilometers}}{\frac{1}{150} \text{ hours}} = 0.4 \times 150 = 60 \text{ km/hr} \]

### Conclusion
The speed of the athlete is 60 kilometers per hour (km/hr).

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