Question

What is the total distance travelled by a train?
I. The train travelled at an average speed of 80 km/h for 4 hours.
II. The train travelled at an average speed of 100 km/h for 2 hours.

• A. If the statement I alone is sufficient to answer the question.
• B. If the statement II alone is sufficient to answer the question.
• C. If the statements I and II together are sufficient to answer the question but neither statement alone is sufficient.
• D. If the statements I and II together are not sufficient to answer the question and additional data is required.

Hint:

To calculate the total distance, use the formula \( \text{Distance} = \text{Speed} \times \text{Time} \), and add the distances covered in each segment.

Answer 1

The Correct Option is D

We are asked to calculate the total distance travelled by the train. The distance travelled by a train is given by the formula:
\[ \text{Distance} = \text{Speed} \times \text{Time} \] - From condition I:
The train travelled at an average speed of 80 km/h for 4 hours. The distance covered in this time is:
\[ \text{Distance}_1 = 80 \, \text{km/h} \times 4 \, \text{hours} = 320 \, \text{km} \] - From condition II:
The train travelled at an average speed of 100 km/h for 2 hours. The distance covered in this time is:
\[ \text{Distance}_2 = 100 \, \text{km/h} \times 2 \, \text{hours} = 200 \, \text{km} \] Thus, the total distance travelled by the train is: \[ \text{Total Distance} = 320 \, \text{km} + 200 \, \text{km} = 520 \, \text{km} \] Therefore, the total distance travelled by the train is \( \boxed{520} \, \text{km} \). Thus, the correct answer is \( \boxed{4} \).