Considering the variation of speed of the rabbit is 15 m/s^2 and it reaches 39m/s, we can find out the time through the following formula:

Then, our final answer is t=2.6s
Tip: On how to find out the time without applying a formula
The answer we want is the time, therefore, it is measured in seconds. The problem gives us two values, one in m/s and the other in m/s^2. We can think of a way to combine these two values in order to obtain an answer in seconds. For this example, if we multiply them
