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4 Length, mass, capacity and time
!e Shanghai Lupu Bridge Key words
across the Huangpu River
is 3.9 km long. Make sure you learn and
How many metres is that? understand these key words:
average speed
compound measures
!is is the Empire
State Building in
New York. For
over 40 years it
was the world’s
tallest building.
It is 44 309 cm high.
Change this to a more
sensible unit of length.
!e Bloodhound rocket car is being designed and built in England.
It will travel at 1690 km/h. How far will it travel in one second?
!e mass of the Bloodhound, including fuel, is 7786 kg.
How does that compare to an ordinary car?
How much water is in this swimming pool? What is the area of a football pitch?
500 litres? 5000 litres? 50 000 litres? 700 m²? 7000 m²? 70 000 m²?
In this unit you will solve problems involving measurements and average speed. You will also use
compound measures such as metres per second and cents per gram to make comparisons in real-life
contexts.
4 Length, mass, capacity and time 33
