David leaves the house to go to
school. He walks
200 meters west and 125 meters
north. How far is he from his
starting point? Round to the
nearest whole meter.

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When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.