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To solve this question, we need to calculate the **relative speed** between the two buses when they are moving towards each other. Here’s how to approach it:

### Given:
- Speed of bus from city A to city B = **603 km/h**
- Speed of bus from city B to city A = **513 km/h**

### Step 1: Convert the speeds from km/h to m/s.
The conversion factor from km/h to m/s is \(\frac{5}{18}\).

1. Speed of bus A:  
   \(603 \times \frac{5}{18} = \frac{603 \times 5}{18} = 167.5 \, \text{m/s}\)

2. Speed of bus B:  
   \(513 \times \frac{5}{18} = \frac{513 \times 5}{18} = 142.5 \, \text{m/s}\)

### Step 2: Calculate the relative speed.
When two objects are moving towards each other, the relative speed is the sum of their individual speeds:

\[
\text{Relative speed} = 167.5 \, \text{m/s} + 142.5 \, \text{m/s} = 310 \, \text{m/s}
\]

Thus, the relative speed is **310 m/s**.

### Correct answer: **(B) 310**

Would you like more details or have any questions?

Here are some related questions:
1. What would be the relative speed if both buses were traveling in the same direction?
2. How does the conversion from km/h to m/s work?
3. What is the physical meaning of relative speed?
4. If one bus was traveling slower, how would that affect the relative speed?
5. How is relative speed used in real-world transportation problems?

**Tip**: Always check if speeds are given in consistent units before performing calculations!

If a bus travels from city A to city B with a speed of 603 kmph and another bus travels from city B to city A with a speed of 513 kmph, find the relative speed when both buses cross each other (in m/s).

Learn how to calculate the relative speed when two buses are traveling toward each other. Given speeds of 603 km/h and 513 km/h, this problem demonstrates the conversion from km/h to m/s and how to apply the relative speed formula for objects moving in opposite directions. Suitable for Grades 9-11.

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