A man can walk 8 km in 1 hour 15 minutes .Find his speed.

Answer

To find the speed of the man who can walk 8 km in 1 hour 15 minutes, we can follow these steps:

### Step 1: Convert the time from hours and minutes to hours only.
The time given is 1 hour and 15 minutes. We need to convert the 15 minutes into hours.

- **Calculation**:
\[ 15 \text{ minutes} = \frac{15}{60} \text{ hours} = \frac{1}{4} \text{ hours} \]

So, the total time in hours is:
\[ 1 \text{ hour} + \frac{1}{4} \text{ hour} = 1 + 0.25 = 1.25 \text{ hours} \]

### Step 2: Use the formula for speed.
The formula for speed is given by:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]

### Step 3: Substitute the values into the formula.
We know the distance is 8 km and the time is 1.25 hours.

- **Calculation**:
\[ \text{Speed} = \frac{8 \text{ km}}{1.25 \text{ hours}} \]

### Step 4: Perform the division.
To divide 8 by 1.25, we can also convert 1.25 to a fraction:
\[ 1.25 = \frac{5}{4} \]
Thus, we can rewrite the division as:
\[ \text{Speed} = 8 \div 1.25 = 8 \times \frac{4}{5} = \frac{32}{5} \]

### Step 5: Convert the fraction to a decimal.
Now, we need to calculate \(\frac{32}{5}\):
\[ \frac{32}{5} = 6.4 \]

### Step 6: State the final answer.
The speed of the man is:
\[ \text{Speed} = 6.4 \text{ km/h} \]