To find out when the two vats will have an equal amount of liquid, we can set up equations for the amount of liquid in each vat over time.
Let \( x \) represent the time in minutes.
For the first vat, which starts empty and is being filled at a rate of 6 gallons per minute, the amount of liquid in the first vat after \( x \) minutes can be expressed as: \[ \text{Amount in first vat} = 6x \]
For the second vat, which starts with 10 gallons and is being filled at a rate of 4 gallons per minute, the amount of liquid in the second vat after \( x \) minutes can be expressed as: \[ \text{Amount in second vat} = 10 + 4x \]
To find when the two vats have an equal amount of liquid, we can set the two expressions equal to each other: \[ 6x = 10 + 4x \]
This equation represents the point in time when both vats will contain the same amount of liquid.