1.4 A water supply reservoir has an annual capacity of 25 x 10' acre-ft. It is serving a city with a present population of 60,000, which is expected to increase to 100,000 in 20 years. How many years from now will the city's needs exceed the reservoir's capacity? Assume arithmetic growth of the population and an average daily draft from the reservoir of 160 gallons per person. Disregard the losses.

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