A 420-metre long train crosses a pole in 70 seconds . What is the speed of the train ?

Options

A. 5 m/s
B. 7 m/s
C. 4.5 m/s
D. None of these

Explanation

To find the speed of the train, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Length of the Train and Time Taken**:
- The length of the train is given as 420 meters.
- The time taken to cross a pole is given as 70 seconds.

2. **Use the Formula for Speed**:
- The speed of the train can be calculated using the formula:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]
- In this case, the distance is the length of the train (420 meters) and the time is 70 seconds.

3. **Substitute the Values into the Formula**:
- Substitute the values into the formula:
\[ \text{Speed} = \frac{420 \text{ meters}}{70 \text{ seconds}} \]

4. **Perform the Calculation**:
- Now, divide 420 by 70:
\[ \text{Speed} = 6 \text{ meters per second} \]

5. **State the Final Answer**:
- Therefore, the speed of the train is 6 meters per second.