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Hint: How many clock-minutes pass for each real hour?

Answer: 6.24am.

Since the clock is gaining 15 minutes every hour, for every real hour that has passed, the clock will show 75 minutes.

Since the clock shows 3.00am, we know that 180 clock minutes have passed.

This equals 144 real minutes (180 / 75 x 60), so the clock shows 2.24 am.

The clock stopped 240 minutes ago (4 hours), so the time must now be 6.24am. QED.

Puzzle 3

What four digit number has digit 1 three smaller than digit 4 which is one more than digit 2 which is twice digit 3 which is not a prime number and is one more than 1/3 of digit 4?

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