I am working on a problem that requires me to divide radiated mass by peak strain, both of which have asymmetric errors. I do not know the details of the error profiles. What techniques are used for the propagation of errors? Basically, I want to compute something like

A=3.4^{+0.7}*{-0.9}
B=2.2^{2.0}*{-0.4}

A/B=

I appreciate your help. Thanks.