If two resistors of R₁ and R: ohms are connected in parallel in an electric circuit to make an R-ohm resistor, the value of R can be found from the equation: 1 =1+1 R₁ R R₂ If R1 is decreasing at the rate of 1 ohm/s and R2 is increasing at the rate of 0.5 ohm/s, at what rate is R changing when R₁-75 ohms and R-50 ohms?

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