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If two electrical resistors are connected in parallel, the total resistance (measured in ohms, denoted by the Greek capital letter omega, Ω) is given by the equation 1/R = 1/R₁+ 1/R₂.
If R₁ is increasing at a rate of 0.5 Ω/min and R₂ decreases at a rate of 1.1 Ω/min, at what rate does the total resistance change when R₁ = 20 Ω and R₂ = 50 Ω/min?