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A hose is filling a water tank at the rate of 70 gallons per minute. A loose drain plug causes 4 gallons per minute to drain out. How many minutes does it take to fill a tank with a capacity of 3960 gallons?​

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Answer:

60 minutes

Step-by-step explanation:

You would do a proportion of 70 gallons over 1 min, which is equal to 66 gallons over 1 min. Then you would set up a second proportion of 66 gal over 1 min equals 3960 gal over x. Once you cross-multiply, you would get 60 minutes.

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