3/4 of the water tank is 3/4*4000 = <<3/4*4000=3000>>3000

If the pipe fills the tank with water at the rate of 10 gallons per hour, it will take 3000/10 = <<3000/10=300>>300 hours to fill the tank to 3/4 of its capacity

# Answer

300
<|im_start|>system
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<|im_start|>user
A water tank has a capacity of 4000 gallons. Mack connects a pipe to the tank that fills the tank with water at the rate of 10 gallons per hour. How long will it take to fill the tank to 3/4 of its capacity?
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user
300
A water tank has a capacity of 4000 gallons. Mack connects a pipe to the tank that fills the tank with water at the rate of 10 gallons per hour. How long will it take to fill the tank to 3/4 of its capacity?
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