Answer:
![k = 5](https://img.qammunity.org/2021/formulas/mathematics/middle-school/2d387jnjs80ye5nwr5ngk4kozs81fvaeef.png)
Explanation:
Given
The table
Required
Determine the constant of proportionality (k)
Represent the time with T and the amount of water with W
k is calculated as follows;
![k = (W)/(T)](https://img.qammunity.org/2021/formulas/mathematics/high-school/cos8tmkobfv9bl708f32li7wg3hg3snyzr.png)
Pick any corresponding values of W and T
![W = 5 \\T=1](https://img.qammunity.org/2021/formulas/mathematics/high-school/rurhmonyhetieo4yq6grujiusyizuxiusz.png)
So
![k =(5)/(1)](https://img.qammunity.org/2021/formulas/mathematics/high-school/neqvysfgzbuf45tofc3li5edholp9grflt.png)
![k = 5](https://img.qammunity.org/2021/formulas/mathematics/middle-school/2d387jnjs80ye5nwr5ngk4kozs81fvaeef.png)
Hence, the constant of proportionality is 5