The answer will depend on decreases by 42 FROM WHAT and OVER WHAT PERIOD.
% rate = 42/3600 * 1.67%
rate is 42 over 2 as a fraction 42 on top 2 on the bottom unit rate is 21 over 1 21 on top 1 on bottom
% rate= (42/75) x 100% = 56%
42
% rate = 42/120 * 100% = 35%
% rate = 84%
Base = 70 Percentage = 42 Rate = 60% or 0.6 Base = Percentage/Rate = 42/0.6 = 70
4.76%% rate:= 2/42 * 100%= 0.0476 * 100%= 4.76%
72.41%% rate:= 42/58 * 100%= 0.7241 * 100%= 72.41%
77.78%% rate:= 42/54 * 100%= 0.7778 * 100%= 77.78%
33.33%% rate:= 42/126 * 100%= 0.3333 * 100%= 33.33%
The revolution rate of Io is 42 hrs. 28 min.