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Let's solve the problem step by step.

**Given:**
- A starts driving from Jaipur to Delhi at **4:00 AM** and reaches Delhi at **4:30 PM**.
- B starts driving from Delhi to Jaipur at **7:30 AM** and reaches Jaipur at **5:30 PM**.
  
We are asked to find the approximate percentage of the journey A had covered by the time A meets B.

### Step 1: Calculate the total time taken by A and B for their journeys.
- A's total journey time:
  \[
  \text{From 4:00 AM to 4:30 PM} = 12.5 \text{ hours}.
  \]
- B's total journey time:
  \[
  \text{From 7:30 AM to 5:30 PM} = 10 \text{ hours}.
  \]

### Step 2: Calculate their speeds in terms of the total distance \( D \) (since they cover the same distance).
- A's speed = \( \frac{D}{12.5} \).
- B's speed = \( \frac{D}{10} \).

### Step 3: Time of meeting.
- Let \( t \) be the time after 7:30 AM when A and B meet.
- By this time, A has been traveling for \( t + 3.5 \) hours (since A started 3.5 hours earlier than B).

At the point where they meet, the sum of the distances they have covered equals the total distance \( D \):
\[
\text{Distance covered by A} + \text{Distance covered by B} = D.
\]
Substitute the distances in terms of speed and time:
\[
\left(\frac{D}{12.5} \times (t + 3.5)\right) + \left(\frac{D}{10} \times t\right) = D.
\]

### Step 4: Solve for \( t \).
Simplifying the equation:
\[
\frac{(t + 3.5)}{12.5} + \frac{t}{10} = 1.
\]
Multiply through by 50 to eliminate the denominators:
\[
4(t + 3.5) + 5t = 50.
\]
Expanding:
\[
4t + 14 + 5t = 50.
\]
Simplify:
\[
9t = 36.
\]
So:
\[
t = 4 \text{ hours}.
\]

### Step 5: Calculate how much of the journey A had completed.
At the time they meet, A had been traveling for:
\[
t + 3.5 = 4 + 3.5 = 7.5 \text{ hours}.
\]
Since A's total journey takes 12.5 hours, the percentage of the journey A had covered is:
\[
\frac{7.5}{12.5} \times 100 = 60\%.
\]

### Final Answer:
A had covered approximately **60%** of the journey when A met B.

---

Would you like further details or have any questions?

Here are 5 related questions:
1. What would happen if B had started earlier than 7:30 AM?
2. How would the result change if A's or B's speed were different?
3. Can you determine the exact location of the meeting point based on the percentage?
4. How can you solve this using relative speed instead of individual times?
5. What is the impact of different starting times on the meeting point?

**Tip:** For problems involving two moving objects, identifying the time and relative speed helps simplify the calculations.

A starts driving from Jaipur towards Delhi at 4:00 AM and reaches at 4:30 PM. B starts driving from Delhi towards Jaipur at 7:30 AM and reaches at 5:30 PM. Approximate what percentage of journey A had covered when he met B?

Learn how to calculate the percentage of journey covered when two vehicles travel towards each other from different cities. This problem focuses on relative speed and time-distance relationships. Suitable for Grades 10-12.

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