Application of the Sine Rule

Hi everyone,

As I was teaching myself the Sine Rule, I happened upon the following question, which needless to say has stumped my attempts to solve it thus far:

Here it is:

From a fire tower, A, a fire is spotted on a bearing of N42 degrees E. From a second tower, B, the fire is on a bearing of N12 degrees W. The two fire towers are 23 kilometres apart and A is N63 degrees W of B.

I assume that N 42 degrees E means that the fire is 42 degrees away due East. And N 12 degrees West means that it is 348 degrees True. But I am not in any way confident on that.

Any help solving this problem will be highly appreciated!

Thanks,

Nathaniel