Part 1 of 2 For their final chemistry project at Delaware University, Malachi and Thandiwe dissolve 197 grams of salt in a vat containing 20 titers of water. Then they add water at a rate of 4 liters of water per minute until the concentration reaches 7 grams/liter. The volume of water after $t$ minutes is given by $V(t)=20+4 t$ liters. Part 2 of 2 How long will Malachi and Thandiwe have to wait until the concentration of salt in the solution reaches 7 grams/liter? minutes. (Remember the concentration is the amount of salt divided by the volume of water) Show or upload your work below.

Step 1 ：Given that Malachi and Thandiwe dissolve 197 grams of salt in a vat containing 20 liters of water. Then they add water at a rate of 4 liters of water per minute until the concentration reaches 7 grams/liter.

Step 2 ：The volume of water after \(t\) minutes is given by \(V(t)=20+4 t\) liters.

Step 3 ：We need to find how long will Malachi and Thandiwe have to wait until the concentration of salt in the solution reaches 7 grams/liter. The concentration is the amount of salt divided by the volume of water.

Step 4 ：To solve for \(t\), we can first multiply both sides of the equation by \((20 + 4t)\) to get rid of the denominator on the left side. This gives us \(197 = 7 * (20 + 4t)\).

Step 5 ：Then we can distribute the 7 on the right side to get \(197 = 140 + 28t\).

Step 6 ：Subtracting 140 from both sides gives us \(57 = 28t\).

Step 7 ：Finally, we can divide both sides by 28 to solve for \(t\).

Step 8 ：Doing the calculation gives us \(t = 2.0357142857142856\).

Step 9 ：Final Answer: Malachi and Thandiwe have to wait approximately \(\boxed{2.04}\) minutes until the concentration of salt in the solution reaches 7 grams/liter.