If two resistors with resistances R₁ and R₂ are connected in parallel, as in the figure below, then the total resistance R, measured in ohms (), is given by

1

R

=

1

R₁

+

1

R₂

.

If R₁ and R₂ are increasing at rates of 0.3 /s and 0.2 /s, respectively, how fast is R changing when R₁ = 50 and R₂ = 110 ? (Round your answer to three decimal places.)