When the ball reaches the target at maximum height H ,the ball will have velocity only in horizontal direction and it will be done during half of the time of flight.
At maximum height vertcal component becomes zero
Again after T time the net vertical displacement will be zero. So
The ball will reach the target after T/2 sec of its relrase i.e.after 1.04s.
(b)So the horizintal distance to be covered to reach the target
(c)The speed of the ball when it reaches the target is nothing but the undiminshed horizontal component of the velocity of projection.