To solve this problem you must apply the proccedure shown below:
1. You have that varies jointly as and and inversely as the product of and . Therefore, you can write the following equation, where is the constant of proportionality:
2. Now, you must solve for the constant of proportionality, as following:
3. Susbtiute values:
4. Substitute the value of the constant of proportionality into the equation: