Two lakes have populations of fish but the conditions are quite different in these lakes In the first lake the fish population is growing and satisfies the differential equation dy dt Time where t is time in years At time t 0 there were 600 fish in this lake In the second lake the population is dying due to pollution Its population satisfies the differential equation years dy dt 0 7y 0 8y and initially there were 8000 fish in this lake At what time will the fish populations in the two lakes be identical