A bus for Delhi leaves every 30 minutes from a bus stand. An enquiry clerk, Ramesh, told Anil, a passenger, that the bus had already left 10 minutes ago and the next bus will leave at 9:35 am. At what time did the enquiry clerk give this information to Anil?

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### Step-by-Step Solution:

1. **Given Information:**  
   - The next bus will leave at **9:35 am**.  
   - The previous bus left **10 minutes ago**.

2. **Determine the time of the previous bus departure:**  
   Since buses leave every 30 minutes, the previous bus would have left at:  
   $$ 9:35 - 30 \, 	ext{minutes} = 9:05 \, 	ext{am}. $$

3. **Time when the enquiry clerk gave the information:**  
   The enquiry clerk informed Anil that the previous bus left **10 minutes ago**, so the time of the enquiry must be:  
   $$ 9:05 + 10 = 9:15 \, 	ext{am}. $$

### Final Answer:  
The enquiry clerk gave this information to Anil at **9:15 am**, corresponding to option **(c)**.

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