The speed of a car is 36 km/hour, in how much time will it cover the distance of 720 meters.

Options

A. 72 second
B. 60 second
C. 80 second
D. 20 second

Answer

To solve the problem of how much time it will take for a car traveling at a speed of 36 km/hour to cover a distance of 720 meters, we can follow these steps:

### Step 1: Convert the speed from km/hour to m/s
The speed is given in kilometers per hour (km/h), but we need to convert it to meters per second (m/s) since the distance is given in meters.

1 km = 1000 meters
1 hour = 3600 seconds

To convert km/h to m/s, we use the formula:
\[ \text{Speed in m/s} = \text{Speed in km/h} \times \frac{1000 \text{ m}}{3600 \text{ s}} \]

Substituting the given speed:
\[ \text{Speed in m/s} = 36 \times \frac{1000}{3600} \]

Calculating this gives:
\[ \text{Speed in m/s} = 36 \times \frac{5}{18} = 10 \text{ m/s} \]

### Step 2: Use the formula to find time
We know the formula that relates distance, speed, and time:
\[ \text{Distance} = \text{Speed} \times \text{Time} \]

We can rearrange this formula to solve for time:
\[ \text{Time} = \frac{\text{Distance}}{\text{Speed}} \]

### Step 3: Substitute the values into the formula
Now we can substitute the distance (720 meters) and the speed (10 m/s) into the formula:
\[ \text{Time} = \frac{720 \text{ m}}{10 \text{ m/s}} \]

Calculating this gives:
\[ \text{Time} = 72 \text{ seconds} \]

### Final Answer
The time taken to cover the distance of 720 meters at a speed of 36 km/hour is **72 seconds**.

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