Chloe and Bao are in motorboats at the center of a lake. At time t-0, Chloe begins traveling south at a speed of 55 km/h. One minute later, Bao takes off, heading east at a speed of 45 km/h. At what rate is the distance between them increasing at t = 11 min? (Round your answer to three decimal places.) ds km/min dt

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step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15