3 years ago

Sanford can assemble a computer in 60 minutes. Colleen can assemble a computer in 40 minutes. If they work together, how many mi

nutes does it take them to assemble a computer? 5 minutes 6 minutes 20 minutes 24 minutes

1 answer:

3 0

$\dfrac{1}{60}+\dfrac{1}{40}=\dfrac{1}{x}\\
\dfrac{2}{120}+\dfrac{3}{120}=\dfrac{1}{x}\\
\dfrac{5}{120}=\dfrac{1}{x}\\
5x=120\\
x=24$

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