Some questions

Thanks for helping

1.Is that correct to write "who" hackers who met?

2. is that correct to write "for those who would succeed"

3. The way I've wrote "another 30 minutes" is correct?

4. Please let me know if that is correct "left to the hackers challenge"

But now, (a report) about dozens of hackers who met last week at the College of Management and they tried to penetrate the cyber defense system and had in front of their eyes, a prize of 100,000$ for those who would succeed. How did it end? There you go. Another 30 minutes, half an hour left to the Hackers challenge. Let's see who will bring 100,000$ home. Let's go, good luck.