Quick Question Regarding a simple Delta Connection.

I have a test coming up next week and I only have a problem with one question. It goes like this:

There are three Identical capacitors which are connected in delta to a 415v, 50Hz three phase supply.

If the line current is 15a, what is the capacitance of each of the capacitors?


Using this information I know the following:

VL = Vph
IL = sqrt(3)Iph
f = 50

IL = 15

I know that I can use the impedance equation to get the capacitance:

XC = 1 / 2 pi fc

but how do I get XC?

 

Divide the phase voltage by the phase current to get the impedance of each capacitor.