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The question shown in the image is about finding the relative speed between two buses traveling in opposite directions. The problem states:

- Bus A travels from city A to city B at 603 km/h.
- Bus B travels from city B to city A at 513 km/h.
- We need to find the relative speed of the two buses when they cross each other.

### Solution:

1. **Relative speed when moving in opposite directions**:
   When two objects move in opposite directions, their relative speed is the sum of their individual speeds.

   \[
   \text{Relative speed} = 603 \, \text{km/h} + 513 \, \text{km/h} = 1116 \, \text{km/h}
   \]

2. **Converting from km/h to m/s**:
   To convert km/h to m/s, we use the conversion factor:
   \[
   1 \, \text{km/h} = \frac{1000}{3600} = \frac{5}{18} \, \text{m/s}
   \]
   Now convert 1116 km/h to m/s:
   \[
   1116 \, \text{km/h} \times \frac{5}{18} = 310 \, \text{m/s}
   \]

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

The correct answer is option (B) 310 m/s.

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Would you like further explanation on any part of this problem? 

Here are some related questions for deeper understanding:
1. How do you calculate relative speed when both objects move in the same direction?
2. Why do we convert km/h to m/s, and how is this conversion done?
3. How does relative speed impact collision scenarios?
4. What if the two buses were traveling at angles instead of opposite directions?
5. Can the relative speed be used to determine the time at which the buses meet?

**Tip:** Always ensure your units are consistent throughout a calculation to avoid errors.

If a bus travels from city A to city B with a speed of 603 km/h and another bus travels from city B to city A with a speed of 513 km/h, find the relative speed when both the buses cross each other. (In m/s)
(A) 314
(B) 310
(C) 312
(D) 316

This math problem explores the concept of relative speed with two buses traveling in opposite directions, one at 603 km/h and the other at 513 km/h. Learn how to calculate their relative speed in m/s using key formulas and unit conversion techniques. Suitable for students in Grades 9-12.

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