Answer:
is in units of 
is in units of 
is in units of 
Explanation:
We have the following expression:

Where:
is the distance, hence its unit is
(meters, assuming we are using the International System of Units)
is the time, hence its unit is
(seconds)
So, the expression is rewritten as:

Since the left side of the equation is in meters, the right side must be in meters as well.
In addition, in the right side we have terms that have to added, this means each term must be in meters:
- For the first term
must be in units of
in order to have meters.
- For the second term
must be in units of
in order to have meters.
- For the third term
must be in units of
in order to have meters.