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In what unit(s) is distance measured?

Since the there are multiple units in which distance is measured, should I use the plural form 'units'? For example,

Meter is one unit to measure distance and kilometer is another unit. Together, they are two units.

What if I know that there is only one unit involved, for example, X-axis on a XY-plot, should I ask 'In what unit is distance measured?' ?
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New2grammarIn what unit(s) is distance measured?

Since the there are multiple units in which distance is measured, should I use the plural form 'units'? For example,

Meter is one unit to measure distance and kilometer is another unit. Together, they are two units.

What if I know that there is only one unit involved, for example, X-axis on a XY-plot, should I ask 'In what unit is distance measured?' ?

What unit is it measured in?
Ok. I think your rational is something similar to "Who is going to attend the meeting?'.

Can I use the plural form too if I know there will be more than 1 person attending- 'Who are going to attend the meeting'? Similarly, 'In what units is distance measured?'.
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New2grammar
Ok. I think your rational is something similar to "Who is going to attend the meeting?'.

Can I use the plural form too if I know there will be more than 1 person attending- 'Who are going to attend the meeting'? Similarly, 'In what units is distance measured?'.

"Can I use the plural form too if I know there will be more than 1 person attending" Yes

'In what units is distance measured?' -- correct
Thanks!