Well, we have the following information:
Well, looks like we need to find
Let's take a look at it, if we implicitly differentiate the first equation, we are left with a are we not?
Looks like it's something we can work with, now we plug it back in to the equation given for
Now we plug in the values:
Notice that it's positive, as the question states, it is increasing.
Just to see how the units work here's the equation without the numbers: