I would use centimeters.
5.4cm
the answer is miles
miles or kilometers
A metre would be the most appropriate unit.
The 'foot' or the 'meter' would both do nicely.
grams most oranges weigh between 200 and 800 grams
the answer is miles
Millimetres
Kilometres.Kilometres.Kilometres.Kilometres.
i would use a meter stick
miles or kilometers
Centimetres, millimetres or inches would be most appropriate for measuring the length of a ruler.
Probably inches or centimeters.
Normal people will use centimetres, but manufacturers and retailers will usually quote millimetres.
A metre would be the most appropriate unit.
Kilograms
ounces
The measurement to use is meter per minute & seconds. The time would be measured in seconds, metres per second is a measure of speed.