Aos= -b/2a so plunin your numbers and you'll get the AOS so you can find the vertex
First you'd convert the seconds into minutes by dividing.
18,000 / 60 (60 secs in a min) = 300 minutes
Then, similarly, you would convert the minutes into hours.
300 / 60 (60 mins in an hr) = 5 hours
The answer is 5 hours.
Answer:

Step-by-step explanation:


3:00 I think. :-)
Hope that helped