September 27, 2012
Lesson 3.4
Rates
The distance formula: d = rt
Consider objects traveling in opposite directions.
Page 216 #12
Tameka leaves Kansas City traveling west on I-70 at an
average rate of 56 mph. At the same time, Akiva leaves
Kansas City traveling east on I-70 at an average rate of
48 mph. How long will it take them to be 300 miles apart?
Categories
Rate
Time
Distance
Tameka
56
t
56t
Akiva
48
t
48t
56t + 48t = 300
1
September 27, 2012
Page 218 #24
Two trains traveling on parallel tracks are going
toward each other from a distance of 378 miles.
If the freight train is moving at 22 mph and the
passenger train is moving at 50 mph, how long it
take them to pass each other?
Categories
Rate
Time
Distance
freight
passenger
2
September 27, 2012
Page 218 #32
Janet and Paul were both traveling west from Charleston,
WV, to Rupp Arena in Lexington, KY, for a basketball
game. At 6 p.m., Janet, traveling 45 mph was 10 miles
west of Paul. A little latter, Paul, traveling at 50 mph,
passed Janet. What time did Paul pass Janet?
Categories
Rate
Time
Distance
Janet
45
T
45T
Paul
50
T
50T
Did Janet and Paul travel the same distance in during
the time in question?
How are the amounts in the distance column related?
3
September 27, 2012
Categories
Categories
Rate
Rate
Time
Time
Distance
Distance
4