Answer: (A) t = d/r
Explanation:
You can arrive at this answer algebraically, as well as by reasoning:
Algebraic:
d = rt | divide both sides by r. Note that r must never equal 0.
d/r = t
t = d/r --> choice (A)
Reasoning:
* the (time) must be proportional to (distance), i.e., the longer the distance the more time it will take.
* the (time) must be indirectly proportional to the (rate/speed), i.e., the faster Kate is moving the less time it will take her to the destination.
The two above are reflected in (A) and only in (A). You can apply a check to the remaining (B) - (D) choice to see that they do not satisfy the two logical expectations.
