The relation between distance (d), time(t) and average speed (s) is expressed as d = s*t. If both s and t arepositive, and s is constant, and t decreases, then
(a) d decreases only if s is greater than t.
(b) d increases only if s is greater than t.
(c) There is no change in d.
(d) increases regardless of the size of r and t.
(e) decreases regardless of the size of r and t.