Answer: Ok, the product of 16 and the time is written as 
 where t is the time. 16 is a scalar and t has units of seconds, so this equation has units of seconds.
when it says "after the start", it means that you waited 
 seconds after the "start" of something.
If we set the time of start as t₀, then "the product of 16 and the time after the start" is : t₀ + 
s