What is the unit rate of rainfall in inches per hour?

Gerry determined that 1/2 inch of rain fell during 3/4 of an hour. What is the unit rate of rainfall in inches per hour?

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3/4 of an hour is 45 minutes.

Set up a proportion.

​{1/2 inch of rain in 45 minutes is proportional to x inches in 60 minutes}

Cross-multiply and divide.

0.5(60) = 45x {cross-multiplied}
30 = 45x {multiplied 0.5 by 60}
x = 30/45 {divided 30 by 45}
x = 2/3 inch {reduced}

2/3 inch per hour is the unit rate

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