How much time would it take for Amy to mow 600 square feet?

Amy can mow 600 square yards of grass in \(1 \dfrac{1}{2}\) hours. At this rate, how many minutes would it take her to mow 600 square feet?

MetroEye: Rate of Work

1 square yard = 1 square feet
\(1 \dfrac{1}{2}\) hours = \(\dfrac{3}{2}\cdot 60\) = 90 minutes

\(\dfrac{600 sq yards}{1 \cdot 1 1/2 hours}\) = \(\dfrac{600 sq feet}{1 \cdot H_2}\) 

Converting to same units,

\(\dfrac{600\cdot 9}{90}\) = \(\dfrac{600}{H_2}\) 

\(H_2\) = \(\dfrac{600\cdot 90}{600\cdot 9}\) = 10 minutes

Amy would take 10 minutes to mow 600 sq.feet.