Train 'A' running at a certain speed crosses another train 'B' running at a certain speed in the length of train 'B'?
I. The length of both the trains together is 450 meters.
II. Train 'A' is slower than train 'B'.

Options

A. if the data in Statement I alone are sufficient to answer the question, while the data in statement II alone are not sufficient to answer to question.
B. if the data in statement Ii alone are sufficient to answer the questin, while the data in statemetn I alone are not suffcient to answer the question.
C. if the data wither in statement I alone or in statement II alone are sufficient to answer the question.
D. if the data event in both the statements I and II together are necessary to answer the question.

Explanation

To solve the problem, we need to determine if we can find the time it takes for Train A to cross Train B using the information provided in the statements.

### Step-by-Step Solution:

1. **Understanding the Problem**:
- Train A crosses Train B in the length of Train B. This means that the time taken for Train A to completely pass Train B is equal to the length of Train B divided by the relative speed of the two trains.

2. **Analyzing Statement I**:
- Statement I tells us that the length of both trains together is 450 meters.
- Let the length of Train A be \( L_A \) and the length of Train B be \( L_B \).
- From this statement, we can write:
\[ L_A + L_B = 450 \text{ meters} \]
- However, this does not provide us with the individual lengths of the trains, nor does it give us any information about their speeds.

3. **Analyzing Statement II**:
- Statement II states that Train A is slower than Train B.
- This means that the speed of Train A (\( S_A \)) is less than the speed of Train B (\( S_B \)), or:
\[ S_A < S_B \]
- While this gives us a relationship between the speeds, it does not provide any specific values or allow us to calculate the time taken for Train A to cross Train B.

4. **Combining Statements I and II**:
- Even when we combine both statements, we still do not have enough information to determine the individual lengths of the trains or their speeds.
- We have:
\[ L_A + L_B = 450 \]
and
\[ S_A < S_B \]
- Without specific values for either the lengths or the speeds, we cannot calculate the time taken for Train A to cross Train B.

5. **Conclusion**:
- Since neither statement alone nor their combination provides sufficient information to determine the time taken for Train A to cross Train B, we conclude that the answer is that we cannot determine the required information.

### Final Answer:
- The answer is: **Neither statement I nor statement II is sufficient to answer the question.**