67. The formula to calculate a rate is r = Which of the following is a equivalent formula?
c) d =
a) d = r *t
b) d = r +t
d) none of the above

a) d = r *t

Explanation:

The equivalent formula for calculating rate is given as:

                 d = r *t

Where d is the amount of substance, r is the rate and t is the time taken.

The rate of process is the amount or quantity attained per unit of time.

It is usually expressed as;

           r  =

So, the other variant will be d = r *t

im not to sure what it is

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