Explanation:
Acceleration is defined as change in velocity with respect to change in time.
Mathematically, Acceleration = \frac{\Delta v}{\Delta t}[/tex]
where = change in velocity
= change in time
When Islas and Hazel both has change in velocity as 30 m/s but still their acceleration is different then it means that change in time for both of them is different.
Thus, they have different acceleration.