Help with Physics Kinematics problem. Will Choose a Best Answer

First we work with the vertical motion:
time: 4s ( to go up and down, so 2 only for going up)
Acceleration: 9.81
initial velocity: ?
final velocity: 0
distance:?

Now you should use one of the kinematic equations that does not have distance in it to find the initial vertical velocity.
Now that you have the initial vertical velocity, you need the initial horizontal velocity. because the equation is d=vt . you have time so you need v to get d.
but now there is a problem with the question, you should have the angle at which the dart was shot in order to use SIN , COS, TAN rules.
If you are saying that it was straight up, so the angle is 90 degrees, then the motion is pure vertical and it does not move horizontally at all. So the horizontal range is zero. But you could find the vertical range with the information above.
the answer 40 is wrong unless there is an angle instead of 90 degrees.
I hope this has been helpful.