In the following questions, each question has four options (A), (B), (C) and (D). Choose the correct option and indicate your correct response.
A boat is flowing in still water at the speed of 18 km/hour. The speed of boat in mis is:

Options

A. 50 m/s
B. 72 m/s
C. 7.2 m/s
D. 5 m/s

Answer

To convert the speed of the boat from kilometers per hour (km/h) to meters per second (m/s), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the given speed**:
The speed of the boat is given as 18 km/h.

2. **Understand the conversion factors**:
- 1 kilometer (km) = 1000 meters (m)
- 1 hour (h) = 3600 seconds (s) (since 1 hour = 60 minutes and 1 minute = 60 seconds, thus 60 x 60 = 3600 seconds)

3. **Set up the conversion**:
To convert km/h to m/s, we can use the following formula:
\[ \text{Speed in m/s} = \text{Speed in km/h} \times \frac{1000 \text{ m}}{1 \text{ km}} \times \frac{1 \text{ h}}{3600 \text{ s}} \]

4. **Substitute the values**:
\[ \text{Speed in m/s} = 18 \text{ km/h} \times \frac{1000}{3600} \]

5. **Calculate the conversion**:
\[ \text{Speed in m/s} = 18 \times \frac{1000}{3600} = 18 \times \frac{1}{3.6} \]
\[ \text{Speed in m/s} = \frac{18000}{3600} = 5 \text{ m/s} \]

6. **Final answer**:
The speed of the boat in meters per second is **5 m/s**.