If two resistors with resistances R1 and R2 are connected in parallel, as shown in the figure, then the total resistance R, measured in ohms (Ω), is given by 1 R = 1 R1 + 1 R2.

If R1 and R2 are increasing at rates of 0.3 Ω/s and 0.2 Ω/s, respectively, how fast (in Ω/s) is R changing when R1 = 90 Ω and R2 = 100 Ω? (Round your answer to three decimal places.)