Answer:
Well both zookeepers are correct but the second zookeepers answer was more accurate.
Explanation:
The first zookeeper gave the equation :

So , In order to find Benards speed which is denoted as x , we would still have to collect like terms to isolate x.
The second zookeeper gave the equation :

In this equation the zookeeper had already isolated x so, only simple addition was needed to find Bernard's speed.
This equation is easier to solve.