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Poisoned water leaks from a crack in a storage tower at an increasing rate of 6t...

Poisoned water leaks from a crack in a storage tower at an increasing rate of 6t L/day and flows into a pond containing 108 L of water. (Note: t is time in days) This leaking water contains 4 g/L of poison. Water in the pond is well-mixed, and 6t L/day leaves the pond, keeping the volume of water in the pond at 108 L. If the pond is initially full, and contains no poison, how many days later does the pond contain 144 g of poison?

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