The Running Dead

Algebra Level 4

The Z-virus is a deadly virus that turns the infected people into zombies. The prevalence rate of the infection is 20% of all citizens, and the incidence rate of new zombies is about 2.5% per hour. With some strict measures, many zombies are terminated until the population has reached a steady state, where the prevalence rate is stabilized and the incidence rate equalizes the termination rate.

Averagely, how many hours do the zombies last before being put down?


Credit: Resident Evil 5 (Constantin Film)
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