Speed

Distance

is

often

measured

in

speed,

which

is

how

fast

something

travels

from

one

place

to

another.

In

the

1800s,

steam

engines

established

the

first

speed

record

at

46.69

kilometres

an

hour.

In

the

early

1900s,

aeroplanes

travelled

about

48

kilometres

an

hour.

Today’s

aeroplanes

travel

at

speeds

of

up

to

1 207

kilometres

an

hour.

Supersonic

planes

can

travel

faster

than

the

speed

of

sound,

which

is

more

than

1 191

kilometres

an

hour.