Applying Rates

1
Applying Rates

• Chapter 3

2
Warm-Up

• 32 days ______ hours
• 1 second ______ minute
• 7 yards ______ inches
• Write the given fraction in simplest form.

3

• A rate is a ratio that compares two units.120
  miles in 2 hours
• A unit rate is a rate per one given unit.60
  miles per hour

4
Suppose a spacecraft leaves Earth at an average
rate of 0.225 km/s. Express its rate of ascent
in kilometers per minute.
5
Highway traffic and safety engineers have some
general guidelines they have developed over the
years and hold now as standards.

• If you are moving at 44 ft/s, it will take a
  minimum of 109 feet to stop your car in an
  emergency.
• How many miles per hour is 44 ft/s?

6
Highway traffic and safety engineers have some
general guidelines they have developed over the
years and hold now as standards.

• If you are moving at 88 ft/s, it will take a
  minimum of 304 feet to stop your car in an
  emergency.
• How many miles per hour is 88 ft/s?

7
During its first ten minutes of flight, the
Concorde climbs from ground level to the altitude
shown by point B on the graph. Estimate the
Concordes rate of change in altitude during this
time period.
8
The graph shows how the altitude of a hot air
balloon changes during a 15-minute test flight.

• Estimate the balloons rate of change in
  altitude during this time.

9
Mt. Everest

• Mt. Everest is 29,035 ft high. How many miles
  is this?

10
Speed of Light

• The speed of light is approximately 186,282.397
  miles per second. What is the speed of light in
  miles per hour?

11
Lance Armstrong

• For his third win, Lance Armstrong won the Tour
  by covering 3,462 km at an average speed of more
  than forty km/hrthe third-fastest time in the
  history of the event. How
  far is 3,462 km in miles?

1 mi 1.609344 km
12
Lance Armstrong

• For his third win, Lance Armstrong won the Tour
  by covering 3,462 km at an average speed of more
  than forty km/hrthe third-fastest time in the
  history of the event. How
  fast is 40 km/h in mph?

1 mi 1.609344 km
13
Coquihalla Highway

• The speed limit on the Coquihalla Highway in
  British Columbia is 110 km/h. What is the
  equivalent speed in units of mi/h, rounded down
  to the nearest multiple of 5?

1 mi 1.609344 km
14
Homework