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Rates, Ratios, Proportions, and Unit Rates. Dawson Durgin B-Block. Rates. A rate is a ratio between two measurements with different units, usually per time. There are two ways it is used.

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Presentation Transcript
rates
Rates
  • A rate is a ratio between two measurements with different units, usually per time. There are two ways it is used.
  • An average rate can be calculated using the total distance travelled between a and b, divided by the travel time
          • An instantaneous rate can be determined by viewing a speedometer.
rate problem
Rate Problem
  • A car is traveling 50 miles per hour. At this rate, how many hours have gone by when the car has traveled 120 miles with a 30 minute break?
  • A: 3 hours
  • B: 4 hours 50 minutes
  • C: 5 hours 36 minutes
  • D: 8 hours
slide4

The correct answer is

  • B: 4 hours 50 minutes
  • This is because you find out how much time has past in 20 miles, so you divide 50 miles by 5, and an hour by 5 to get 120 minutes in one hour