I've found the missing details of this task, so I can help you out:
First: keep in mind that the value of vertical motion does not depend on horizontal motion. The task asks you to figure the amount of time for a drop of water to fall 1 meter from Isabella's hand and check whether this time is enough for the water to reach the boy.
Solution for vertical motion: [tex]d = 0.5AT^2
1 = 0.5*9.8 * t^2
1 = 4.9 t^2
t = 0.45 s [/tex]
For horizontal motion:
[tex]d= vt
d = 3.5 * 0.45 = 1.58 m [/tex]
Now you can see that this amount of time is not enough.