Assignment:
The zombie apocalypse is upon you! Zombies are showing up at a rate of 15 zombies per hour, and their numbers are increasing by 5 zombies every 3 hours. On average you can kill 35 zombies per hour. Help is going to arrive in 15 hours, will you be overrun before the help arrives?
Provide complete and step by step solution for the question and show calculations and use formulas.