Compute unit rates associated with ratios of fractions, including ratios of lengths, areas and other quantities measured in like or different units. For example, if a person walks 1/2 mile in each 1/4 hour, compute the unit rate as the complex fraction 1/2 / 1/4 miles per hour, equivalently 2 miles per hour.
7.RP Ratios and Proportional Relationships
7.RP.A Analyze proportional relationships and use them to solve real-world and mathematical problems.