A train 180 m long taken 20 sec. In crossing a tunnel 460m long. The speed of the train is

Options

A. 32
B. 36
C. 28
D. can't be determine

Answer

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

### Step-by-Step Solution:

1. **Identify the lengths involved**:
- Length of the train = 180 m
- Length of the tunnel = 460 m

2. **Calculate the total distance to be covered**:
- When the train crosses the tunnel, it needs to cover its own length plus the length of the tunnel.
- Total distance = Length of the train + Length of the tunnel
- Total distance = 180 m + 460 m = 640 m

3. **Identify the time taken to cross the tunnel**:
- Time taken = 20 seconds

4. **Use the formula for speed**:
- Speed = Distance / Time
- Substitute the values: Speed = Total distance / Time = 640 m / 20 s

5. **Calculate the speed**:
- Speed = 640 m / 20 s = 32 m/s

6. **Conclusion**:
- The speed of the train is 32 m/s.

### Final Answer:
The speed of the train is **32 m/s**.

---