A 90kg drug dealer's carcass is placed in a bath of acid in a metal container, and the carcass decays exponentially at a rate of 33 grams per deciday. Meanwhile, the 100 kg metal tub reacts to the acid, decaying at a rate of 5 grams per hour. The tub will be structurally incapable of holding when the metal bottom, which forms an ellipse with semimajor axis 1m and semiminor axis 0.5m, thinning linearly from 1 cm at the edge to 0.25 cm at the centroid, reaches a thickness of less than 1mm over 50% of the bottom area. Also, the acid potency is dropping at a rate of a^0.3, where a is the common hydrogen ion dispersal rate for muriatic acid. Will the drug dealer's body decay before the tub fails?
For bonus points, consider that an identical tub holding a 120 kg man is on a train approaching 0.9c. Accounting for Lorentz contraction, which body or tub will fail first?