In c=ab, as b increases and a stays constant, c does what?

Given the equation is c=ab, where a stays constant.
It means c is directly proportional to b. In other words, either both increase or both decrease simultaneously.
If there is some increase in b, there will be increase in c too.

Hence, C increases as B increases.

3mph

Step-by-step explanation:

his speed per hour will be 3 miles per hour