This document discusses speed, distance, and time relationships. It provides definitions for speed, average speed, and the relationship between speed, distance, and time. It gives examples of calculating average speed for journeys with multiple speeds and examples of using the speed, distance, and time relationship to solve problems. The document aims to have students practice these concepts by matching speed, distance, and time cards.

1. PROBLEM:
Richard covered a distance of
120 km in 4 hours.
What is the rate of change in
the distance per unit of time?
ANSWER: 30 km/hr

2. SPEED
It is the measure (rate of
change) of distance covered
per unit of time.
It can be expressed in km/hr
or m/s.

3. RELATIONSHIP BETWEEN
SPEED, DISTANCE, AND TIME
Distance = Speed x Time
Speed Time
Distance

4. AVERAGE SPEED
It is the speed for the entire
journey when a distance is
covered at different speeds
during different time intervals.

5. AVERAGE SPEED
It is the speed for the entire
journey when a distance is
covered at different speeds
during different time intervals.

6. AIM
Today we will
match cards using
the relationship
between speed,
distance, and
time.

7. TASK:
Speed Distance Time
45 km/hr 2 hr
130 km/hr 780 km
20 km 40 min
20 m/s 60 s

8. EXAMPLE:
John rides his bicycle from his
house to his grandmother’s
house. He travels at 8km/hr for 15
minutes and then at 6 km/hr for
25 minutes.
If John has to tell us the speed of
his journey, what should he say?
Will it be 8km/hr or 6km/hr?

9. EXAMPLE:
The average speed of a car for
the first 3 hours is 70 kph. Its
average speed for the next 2
hours is 80 kph. Find its average
speed for the whole trip?

10. EXAMPLE:
The average speed of a car for
the first 3 hours is 80 kph. Its
average speed for the next 2
hours is 90 kph. Find its average
speed for the whole trip?

11. EXAMPLE:
Troy took 3 hours to drive from
town A to town B at an average
speed of 40 km/hr. Find the
distance between town A and
town B?

12. EXAMPLE:
Troy took 3 hours to drive from
town A to town B at an average
speed of 60 km/hr. Find the
distance between town A and
town B?

13. EXAMPLE:
Neil covered one-third of the
distance at an average speed of
45 km/hr, one third at an average
speed of 60 km/hr, and the
remaining at an average of 40
km/hr. What was his average
speed for the total distance
traveled?

14. EXAMPLE:
Adam covered half the
distance at 50 km/hr and the
rest at 40 km/hr. What was his
average speed?
Mark traveled at 50km/hr for 2
hours and at 75 km/hr for 3
hours. Find the average speed.

15. FINISH S3
on page 12 of
your
Workbook.
CLASS WORK:

16. Complete
Practice Questions
#s 1 – 3, page 87 – 88
from your XSEED
Content Book.
HOMEWORK: