The original formula: c = m - (bt)
Burn rate formula: c = m - (bt) => bt = m - c => b = (m-c)/t
Maximum fuel formula: c=m - (bt) => m = c + (bt)
Where t = 120 and c = 0
Burn rate: if m = 100 => b = (100 - 0) / 120 = 10/12 = 5 / 6 = 0.83(repeating)
Maximum Fuel: if b = 2 => m = 0 + (2*120) = 240