Chapter 15 Time And Temperature Worksheet Page 16
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TIME AND TEMPERATURE (Chapter 15)
If it is 2:45 am on Sunday in Tokyo, what is the standard time in:
4
a
San Francisco
b
Mumbai
c
Lima
d
Auckland?
If it is 3 pm in Moscow on Friday, what is the standard time in:
5
a
Nairobi
b
Beijing
c
London
d
Los Angeles?
G
AVERAGE SPEED
Speed is a measure of how fast something is travelling. Most objects do not travel with
exactly the same speed all the time, so we say the speed varies.
The average speed of an object in a given period of time is the constant speed at which it
would need to travel in that time period so as to travel the same distance.
The average speed can be calculated using the formula:
distance travelled
average speed =
time taken
For example, if a car travels a distance of 180 km in two hours then its average speed is
180 km
= 90 km per hour.
90
On average it travels
km in each hour.
2 hours
Example 10
Self Tutor
Find the average speed of a car which travels 720 km
in 9 hours.
Speeds are measured in
km
distance
km per hour or
Average speed =
h
time
distance
720 km
:
which is
=
time
9 hour
= 80 km per hour.
FINDING DISTANCES TRAVELLED
If we travel at 60 km per hour for 3 hours, we will travel a distance of 60 £ 3 = 180 km.
60
£ 3
= 180
Notice that we worked out
speed
time
distance
distance = average speed £ time taken
So,
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